Daily Junction.mobi portalMarketing · January 17, 2025 · Harper Quinn · 5 min
Retargeting shows ads to people who have already interacted with your business. This guide explains how it works, why it can be effective, the UK consent rules, and how to use it without annoying people.
You browse a pair of shoes, decide to think about it, and for the next week those exact shoes seem to follow you across the internet. That is retargeting — and while it can feel a little uncanny, there is a straightforward logic behind it. Most people who visit a website leave without buying. Retargeting is the attempt to win some of them back by advertising specifically to people who have already shown interest, rather than starting cold with strangers. Done well it is one of the more efficient forms of online advertising; done badly it is the reason people reach for an ad blocker.
This article is general information about marketing practice and UK rules, not legal advice. For anything specific to your business, check the ICO's guidance or take professional advice.
Retargeting, also known as remarketing, is online advertising aimed specifically at people who have already interacted with your business — most commonly by visiting your website. Instead of paying to reach a broad, cold audience, you concentrate your advertising on "warm" prospects who already know you exist and have shown a flicker of interest.
The premise is simple and well founded: a person who has visited your site, viewed a product or started a checkout is far more likely to buy than someone who has never heard of you. Retargeting reaches that person again at the moment they are most persuadable. It tends to do its best work lower down the marketing funnel, nudging interested people towards a decision rather than creating awareness from scratch.
The mechanics are less mysterious than the experience suggests. In the classic version:
Cookies have long been the workhorse here, though the industry is shifting as browsers restrict third-party tracking. Today retargeting also draws on other signals, depending on the platform:
| Retargeting based on | Example audience |
|---|---|
| Website visits | Everyone who viewed a product page but did not buy |
| Specific actions | People who added to basket and abandoned it |
| Customer lists | Uploaded email addresses of existing contacts |
| Engagement | People who watched a video or interacted with a social post |
The common thread is that every audience is built from people who have already done something, which is what separates retargeting from ordinary advertising to strangers.
Retargeting earns its place for a few practical reasons:
None of this makes retargeting magic. It works best as one part of a broader plan, reinforcing other activity rather than carrying the whole campaign.
Here is the part businesses most often overlook. Retargeting itself is lawful, but the tracking that powers it is regulated, and getting this wrong is a real risk.
In the UK, two overlapping frameworks apply, both overseen by the Information Commissioner's Office (ICO):
In practice this means you need a proper cookie consent mechanism — a banner that lets people genuinely accept or reject non-essential cookies, not a pre-ticked box or a wall that only offers "accept" — and clear, honest privacy information explaining what tracking you use and why. The ASA's rules on honest, clearly identifiable advertising also apply to the ads themselves. Treat compliance as the price of entry, and lean on the ICO's own cookie guidance for the detail.
The line between a helpful reminder and an unwelcome stalker is thin, and crossing it does real damage to your brand. A few habits keep you on the right side:
Get this balance right and retargeting feels like a timely nudge. Get it wrong and it becomes the textbook example of advertising that makes people dislike a brand.
Retargeting shows ads to people who have already interacted with your business, reaching warm prospects who are more likely to buy than cold strangers. It works by tagging visitors — long via cookies, increasingly via other signals — and showing them relevant ads elsewhere online, which makes it efficient and especially good at recovering near-misses like abandoned baskets. But the tracking behind it needs genuine consent under PECR and the UK GDPR, enforced by the ICO, so a proper cookie banner is essential. Cap the frequency, set time limits and exclude existing customers, and retargeting becomes a smart, well-mannered way to turn interest into sales rather than an exercise in following people around the web.
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