Google Tag Manager is a tag management system that has the same functionality as the Google tag and lets you configure and instantly deploy tags on your website or mobile app from an easy-to-use web-based interface. In addition, Tag Manager features support for tag organization and version control, 3rd party and community-developed tag templates, and enterprise collaboration and security features. Tag Manager helps to optimize tag deployment, reduce tag configuration errors and allows you to modify and deploy tags on your site instantly from a web-based interface.
