Tracking in Online Marketing

What is Tracking?

Tracking (known in German as "Nachverfolgung") refers to the recording and evaluation of user behavior on a website or across various channels in online marketing. It involves understanding where visitors come from, what they do on a site, which paths they take, and whether they perform a desired action (a conversion). Tracking is therefore the foundation for all success measurement in digital marketing, because only what is measured can be specifically improved.

Without tracking, online marketing would largely remain a shot in the dark. Only the collected data reveals which measures are effective, which channels provide the most value, and at which points visitors drop off. At the same time, tracking is closely linked to data protection, especially in Germany and the EU, making it a sensitive topic.

What is captured during tracking?

Depending on the objective, tracking can capture various types of information, such as:

Origin of visitors: The channel through which a user arrives, such as organic search, ads, social media, or newsletters.
Behavior on the site: Which pages are visited, how long (session duration), and in what order.
Interactions: Clicks, scrolling behavior, completed forms, or viewed products.
Conversions: Whether and when a desired action, such as a purchase or registration, occurs.
Technical data: For example, the device used, the browser, or the approximate region.

How does tracking work technically?

Various techniques are used for tracking, some of which you may already know from your glossary:

Cookies: Small text files stored in the browser to recognize a user. There are first-party cookies (from the visited site itself) and third-party cookies (from third parties, such as advertising networks).
Tracking pixels: Tiny, invisible image elements that record the loading of a page or the opening of an email (see counting pixel).
Tracking parameters in URLs: Additions to the address, such as UTM parameters, which identify the origin of a visitor.
Server-side tracking: Here, data is collected not in the browser but via the website’s own server and forwarded.

The major shift: the end of third-party cookies

One particularly important and current note is that tracking has changed significantly. For many years, online marketing relied heavily on third-party cookies, which allowed users to be tracked across different websites. This foundation has largely collapsed: browsers like Safari and Firefox have long blocked third-party cookies, and they are also heavily restricted in Chrome. Cross-site tracking via third-party cookies therefore hardly works reliably anymore.

In response, new, more privacy-friendly approaches have become established:

First-party data: Data that a company collects directly with consent, such as via its own website or newsletter, is now considered the most valuable and reliable foundation.
Server-side tracking: Gaining importance as it is less dependent on browser restrictions.
Cookie-less tracking: An umbrella term for methods that work without third-party cookies.

Tracking and data protection: particularly important in Germany

Since tracking can involve the processing of personal data, the legal framework is crucial for your target audience. The key points are:

Consent required: For tracking that is not technically essential (such as marketing and analytics tracking), prior, active user consent is generally necessary.
Cookie banners and consent management: Websites obtain this consent via a consent banner (consent management platform) and document it.
Transparency under GDPR: Users must know what data is collected and for what purpose, as outlined in the privacy policy.
Freedom of choice: Users must be able to reject tracking without being unreasonably denied access to the site.

This note serves as an overview and does not replace legal advice. In case of doubt, the specific implementation should be reviewed by an expert.

Which tools are used for tracking?

Common tools include Google Analytics (GA4) for web analysis, the Google Search Console for data from organic search, and Google Tag Manager for managing various tracking components. Additionally, consent management platforms activate tracking only after consent has been given. It is important to always consider tracking in the context of your own goals and key performance indicators (KPIs), because data alone does not provide value—only its analysis and the resulting improvements create value.

Conclusion

Tracking involves the recording and evaluation of user behavior and forms the basis for all success measurement in online marketing. It shows where visitors come from, how they behave, and whether they convert, thereby making it possible to see which measures are effective. Technically, tracking relies on cookies, tracking pixels, URL parameters, and increasingly on server-side methods. Awareness of the profound shift is crucial: since third-party cookies have largely disappeared, the focus has shifted to first-party data and privacy-friendly approaches. Especially in Germany and the EU, compliance with GDPR, including valid consent, is indispensable. When used responsibly and purposefully, tracking provides valuable insights without compromising user trust.