Definition
What is Google Tag Manager?
Google Tag Manager is a free tag management system that allows marketers to deploy and update tracking tags on a website without modifying site code. Tags for GA4, Google Ads, Meta Pixel, and other platforms are configured through a web interface using triggers (conditions) and variables (data references). Changes are published as container versions.
Why it matters
GTM reduces dependency on engineering for analytics and marketing tag changes, which speeds up implementation and reduces the risk of tracking gaps during deployments.