Google Tag Manager is a tag management system that allows you to quickly and easily update:
1. Tags and code snippets on your website or mobile app, such as those intended for traffic analysis and marketing optimization. You can add and update AdWords, Google Analytics, Floodlight, and 3rd party or custom tags from the Google Tag Manager user interface instead of editing site code.
2. Configuration and flag values of mobile apps. Instead of rebuilding and deploying new mobile app binaries, you can use the Google Tag Manager interface to change configuration values (such as timeouts, ad positioning, game play dynamics) and turn on flag-enabled features.