SEM positioning: what it is, how to optimise campaigns and maximise return on search engines

65% of online experiences begin on a search engine. Of that traffic, the first paid results capture up to 50% of clicks in searches with commercial intent. Yet most companies manage their SEM campaigns without a clear structure, wasting budget on clicks that never convert.

SEM positioning is not about bidding higher than the competition. It is about building a system where ad relevance, landing page quality and targeting precision work together to reduce costs and increase conversions. According to Google, advertisers who optimise their Quality Score reduce their cost per click by up to 50% without losing positions.

At CRONUTS.DIGITAL we design performance marketing strategies that integrate SEM with the rest of the channels to maximise the return on every euro invested. This article breaks down what SEM really is, how to structure profitable campaigns and which metrics you should control to scale results.

# What SEM positioning is and why it remains key in 2026

SEM positioning (Search Engine Marketing) is the digital marketing strategy that uses paid advertising on search engines to position a website in the top results. Unlike SEO, which seeks organic visibility over the medium to long term, SEM offers immediate and controllable visibility from day one.

The main platform is Google Ads, which works through a real-time auction system. When a user searches for a term, Google evaluates the active ads, their relevance and their bid to determine which ads are shown and in what position. This process happens in milliseconds for each search.

In 2026, SEM remains essential because searches with commercial intent generate the largest volume of direct conversions. While other channels build brand awareness, SEM captures active demand: users who are already looking for what you offer. That explicit intent is what makes SEM the channel with the highest direct conversion rate in most sectors.

# SEM vs SEO: differences and when to prioritise each strategy

SEM and SEO share a goal (visibility in search engines) but operate with opposite mechanics. Understanding their differences is fundamental to deciding how to distribute investment.

SEO: long-term organic visibility

SEO works on the technical optimisation of the site, the creation of relevant content and the building of authority to position organically. Results take months to materialise, but once achieved they generate sustainable traffic with no cost per click. Investment in content strategy and the optimisation of Core Web Vitals are pillars of this approach.

SEM: immediate control over visibility

SEM allows you to appear in the top positions from the moment the campaign is activated. It offers total control over which searches trigger your ads, how much you pay for each click and which page the user lands on. That granular control is impossible to achieve with SEO, where the algorithm decides which content ranks and when.

When to combine SEM and SEO

The optimal combination depends on the business moment. SEM is a priority for launches, temporary promotions and high-competition keywords where SEO has not yet achieved positions. SEO is a priority for high-volume informational keywords that generate recurring traffic. The most profitable strategy uses SEM data (which keywords convert) to inform the long-term organic growth marketing strategy.

# Key components of a profitable SEM campaign

A profitable SEM campaign is built on four pillars that must work in a coordinated way: keywords, ads, landing pages and bidding structure.

Keywords determine when your ads are shown. The selection must include terms with clear commercial intent and exclude irrelevant searches through negative keywords. A common mistake is using keywords that are too broad, which generate impressions but no conversions.

Ads must respond directly to the user’s search intent. The headline must include the keyword, the description must highlight the differential benefit and the call to action must be specific. The ad’s CTR (Click Through Rate) directly affects the Quality Score and, therefore, the cost per click.

Conversion landing pages are where the return materialises. They must be fully consistent with the ad: if the ad promises a free demo, the landing must offer exactly that. Loading speed, message clarity and form simplicity are factors that determine the conversion rate.

SEM is not an expense, it is an investment with measurable return. The key is to build a system where every euro invested generates data that makes it possible to optimise the next euro. Without that continuous-improvement mindset, SEM becomes a bottomless pit.

Albert Puig Navàs · Co-Founder & Head of Growth at CRONUTS.DIGITAL

# How to structure a SEM campaign step by step

The campaign structure determines the capacity for subsequent optimisation. A poorly designed structure limits control over budget, targeting and reporting.

The first step is to define the business objective: lead generation, direct sales, qualified traffic or brand awareness. Each objective requires a different configuration of campaign, bid and success metrics.

The second step is keyword research. Analyse search volume, competition and estimated cost per click. Group keywords by intent: informational, comparative and transactional. Each group must have its own ad group with adapted messages.

The third step is to create the account structure: campaigns separated by product or service, ad groups organised by keyword theme and at least three ad variations per group for testing. This granularity makes it possible to identify which keyword-ad-landing combinations generate the best performance.

The fourth step is to configure conversion tracking before activating the campaign. Without reliable conversion data, any subsequent optimisation is impossible. Define which actions count as a conversion and assign values to each one to calculate the real return.

# Quality Score and its impact on cost per click

Quality Score is the Google Ads metric that evaluates the quality and relevance of your keywords, ads and landing pages. It is measured on a scale of 1 to 10 and has a direct impact on two critical variables: ad position and cost per click.

A high Quality Score means that Google considers your ad relevant to the user’s search. As a reward, it positions you higher while paying less. An advertiser with a Quality Score of 9 can pay up to 50% less per click than one with a Quality Score of 5, occupying the same position.

The three factors that determine the Quality Score are: the expected CTR of the ad, the relevance of the ad to the keyword and the experience of the landing page. Improving each of these factors reduces costs and increases visibility simultaneously.

# Bidding and budget strategies to maximise ROAS

The bidding strategy determines how much you pay for each click and how your budget is distributed. Google Ads offers manual and automated strategies, each with specific advantages.

Manual CPC bidding allows you to control the maximum cost per click for each keyword. It is ideal for small accounts or when you need total control over the investment. Automated bidding (Target CPA, Target ROAS, Maximize Conversions) uses machine learning to optimise bids in real time according to the conversion probability of each search.

To maximise ROAS, the key is to segment the budget according to performance. Assign more budget to the campaigns and keywords that generate profitable conversions and reduce investment in those that don’t meet objectives. Marketing KPIs should be reviewed weekly to adjust the budget distribution.

# Advanced targeting in SEM campaigns

Targeting is what separates a mediocre SEM campaign from a profitable one. Showing the right ad to the right person at the right moment is the basic principle, but advanced targeting options make it possible to go much further.

Audience targeting makes it possible to direct ads to users who have already visited your website (remarketing), who are similar to your current customers (similar audiences) or who show purchase intent in your category (in-market audiences). Each type of audience requires different messages and bids.

Geographic, device and time-of-day targeting makes it possible to adjust bids according to the user’s context. If your conversions are concentrated on mobile between 6pm and 10pm, you can increase the bid for that segment and reduce it in the others. This granularity directly impacts budget efficiency and the optimisation of the digital customer journey.

# Common mistakes in SEM positioning and how to avoid them

The most costly mistake is not using negative keywords. Without them, your ads appear in irrelevant searches that consume budget without generating conversions. A well-maintained list of negatives can reduce wasted spend by between 20% and 40%.

Another frequent mistake is sending all the traffic to the home page instead of to specific landing pages. Each ad group must direct to a page that responds exactly to the search intent. Consistency between keyword, ad and landing is the factor that most impacts the conversion rate.

It is also common not to implement conversion tracking from the start. Without conversion data, optimising is impossible: you don’t know which keywords generate customers and which only generate clicks. Setting up tracking before activating the campaign is a requirement, not an option. The same applies to the lead nurturing process: without data on the user’s complete journey, optimisation stays on the surface.

# Essential metrics to evaluate SEM performance

SEM performance is evaluated with metrics that connect advertising investment to business results. Vanity metrics (impressions, total clicks) are useful as volume indicators, but decisions must be based on efficiency metrics.

CPA (Cost per Acquisition) measures how much each conversion costs. ROAS (Return on Ad Spend) measures how many euros each euro invested generates. Quality Score indicates the general health of the account and its potential for improvement. CTR (Click Through Rate) measures the relevance of the ad to the search and connects directly to the CTR formula that determines the Quality Score.

The definitive metric is the ratio between the value of the conversions generated and the total investment (including management and tools). A profitable SEM generates more value than it consumes. If that ratio is negative in a sustained way, the problem is in the campaign structure, not in the channel.

# AI and automation in SEM: the future of search advertising

Artificial intelligence is transforming SEM positioning at an accelerated pace. Google Ads’ automated bidding strategies already use machine learning models that analyse real-time signals (device, location, time, search history) to adjust the bids of each individual auction.

Responsive search ads (RSA) make it possible to create multiple variations of headlines and descriptions that Google combines automatically to show the most relevant version to each user. Marketing automation integrated with SEM makes it possible to connect campaign data with nurturing flows that convert clicks into customers progressively.

The impact of generative AI is also reaching search. AI-generated answers in Google’s results (AI Overviews) are changing user behaviour, which makes it necessary to adapt SEM strategies. Integration with GEO (Generative Engine Optimization) is already a necessity to maintain visibility in a search ecosystem that is evolving towards conversation with AI.