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Tag manager

A tag manager is a tool for deploying and managing tracking code on a website without changing the site code each time.

Written by Reflective Data experts · updated Oct 5, 2026

Marketers and analysts can add, change and test tags in a web interface, while developers keep control of the underlying data layer. Google Tag Manager is the most widely used example.

Used well, a tag manager speeds up work. Used badly, it becomes a pile of duplicate tags that slow the site down.

related

Data layerGoogle Tag ManagerServer-side tagging

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