Tag

Definition

A tag is a code fragment embedded in web pages to collect data about visitor behavior and transmit it to a third-party tool. The most common tags are those for GA4, Google Ads, Meta Pixel, LinkedIn Insight Tag and consent solutions.

How it works

A tag executes in the visitor’s browser (client-side) or on an intermediate server (server-side). It collects contextual information (URL, referrer, event parameters) and sends it to a collection endpoint as a hit. Each tag has firing rules that define when it should execute (all pages, on a specific click, after a purchase).

Tag management

Managing tags directly in the site’s source code is risky and hard to maintain. This is why a TMS like Google Tag Manager is used, allowing you to add, modify and remove tags without a technical deployment. The TMS centralizes all tags and their rules in a graphical interface.

Performance impact

Each tag adds weight and execution time to the page. An over-tagged site (too many tags, or poorly configured ones) suffers measurable performance degradation. A tracking audit identifies unnecessary, redundant or malfunctioning tags.