What is Google Tag Manager
GTM is a container that holds all your website/app’s tags, whether they be Google, third-party or even custom tags. It is thus possible to manage all your tags in a unique point, completely autonomously, reducing the involvement of your development team and significantly cutting the time to get online.
Not to mention that your site gains better performance if compared with hard-coded scripting: tags executed via GTM are deployed asynchronously, meaning a slow loading tag won’t block other tags from being fired.
Security is an important feature provided. Version history helps to track all the different updates, test them in preview mode and publish or roll back to a previous one. Workspaces allow to grant and select the level of access to multiple teams and let them collaborate efficiently publishing tags at the same time.