Google Tag Manager is Google’s tag management system for deploying and managing tracking tags without editing site code every time.
It matters because analytics turns marketing activity into decisions. Without clear measurement language, teams may misread performance, overvalue the wrong channels, or miss the actions that actually drive revenue.
Example
Example: Instead of asking a developer to hard-code every analytics script, a team can use Google Tag Manager to deploy GA4, Google Ads, Microsoft UET, and Reddit Pixel tags from one container.