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Online advertising: what it is and how it works

Online advertising is not just ‘running an ad’ – it is a system: a platform, a message and a page that turns interest into action. In this article you will see how the auction works on Google and Meta, why targeting is more than age and interests, and how to avoid ‘clicks with no results’ with a clear offer, trust and a good landing page. We will also look at how a campaign is optimised through testing, data and remarketing that finishes the conversation instead of annoying people.

Brayan Iliev

Online advertising is a paid way to reach the right people online and prompt them to act – send an enquiry, buy, call or sign up. The biggest misconception is that it simply means “running an ad”. In reality it is a system of three parts: the platform, the message and the place where the person lands (website/landing page).

How does it work in practice?

Most platforms (Google, Meta, YouTube, TikTok) serve ads through an auction. The biggest budget does not automatically win. What wins is the combination of:

  • relevance to the audience
  • quality of the creative
  • the experience after the click

If the ad attracts the right people and they actually take action, the platform “sees” this and gives you a better distribution of impressions.

    Targeting: “the right people” is not just about interests

    Targeting is not simply “men aged 25–45”. That is far too broad and rarely tells you who will actually buy or leave an enquiry. Platforms work with signals – behaviour (what people click and how long they stay), intent (whether they are looking for a solution right now) and context (what content they respond to, which device they are on).

    The strongest audiences are people who have already engaged: they visited the website, watched a video, sent a message, added something to the basket or reached checkout. With them you are not guessing their interest – you can see it, and you simply offer the next logical step.

    The more clearly you set the goal (for example “enquiry”), the better the algorithm finds people who are likely to do exactly that. If you optimise for traffic, you will get clicks. If you optimise for enquiries/purchases and measure them correctly, the platform starts looking for users with a higher likelihood of a real result.

    Why are there sometimes clicks but no results?

    A click is a signal, not a result. If the ad promises one thing and the page does not confirm it, conversions drop.

    Common reasons:

    An unclear offer
    Example: the ad says “20% off”, but the page does not make clear which products it applies to, how long it is valid and how to claim it. The visitor wonders, scrolls around and leaves.

    Lack of trust
    Example: you advertise a “Professional cleaning” service, but the page has no real before/after photos, no reviews, nothing about who is behind the business and no terms (guarantee, timeframe, what is included). The result: “OK, but who am I supposed to trust?”

    A slow website
    Example: the ad leads to a page that takes 6–7 seconds to load on mobile data. The user is on the move, taps “back” and goes to a competitor whose page loads instantly.

    A confusing structure
    Example: the person clicks for “price and booking” but lands on a long home page with no clear sections and no visible “Book now” or “Order” button. They have to scroll, guess and search – and they give up.

    A heavy form
    Example: for a simple enquiry you ask for 10 fields (national ID number, address, company details, extra questions). The user runs out of patience and abandons it at the second field. A better option is often 3–4 fields plus a “Send an enquiry” option.

    That is why successful advertising does not “chase” clicks – it aligns: message → page → action. If the ad promises something specific, the page has to confirm it immediately, and the action has to be easy and obvious.

    Online advertising is a process, not a one-off hit

    You launch a campaign, collect data and make adjustments – that is the normal cycle, not a “failure”. At the start the goal is to understand what works: which visuals stop the scroll, which messages lead to real actions (enquiry, purchase, call) and which audience responds best. Then you switch off the weak variants and move the budget to the successful ones.

    You test different creatives and angles – for example “solving a problem” versus “showing a result”, video versus a static visual, price versus value. When you find a combination that is proven to deliver results, you invest more in it and scale gradually.

    And once someone has already shown interest, remarketing comes in – not as chasing them with the same thing over and over, but as a logical continuation. People who visited the website see proof (reviews, examples); people who added to the basket get a clear reason to complete the purchase (terms, delivery, guarantee); and people who watched a video get the next step with a specific CTA. That way remarketing “finishes the conversation” instead of being annoying.

    Conclusion

    Online advertising works when you treat it as an organised system rather than “a promo that has been switched on”. Platforms distribute impressions based on signals and results, so the most important thing is to give them a clear goal, correct tracking and a page that delivers on the ad’s promise. If you align message → landing page → action, you will stop chasing clicks and start generating predictable enquiries and sales. And with testing, optimisation and sensible remarketing, advertising becomes a process that gets stronger over time – not a one-off chance.

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    Written by Brayan Iliev
    Brayan Iliev is a PPC Specialist at Evol.bg and one of those people who like to find the “why” behind the results. He has been working in PPC for about a year but is progressing quickly because he combines learning with practice. He completed SoftUni's 9-month Advanced programme in digital marketing and then moved into real work at Evol.bg, where he learned the processes of managing client accounts, controlling and allocating budgets, daily optimisation and reporting. He successfully completed a 6-month internship programme working on live campaigns and gained confidence in making decisions based on data rather than gut feeling. He already has experience managing five-figure budgets (more than €10,000 in total) and campaigns for both service businesses and online shops – where every number matters.
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