Variables in GTM are dynamic placeholders that provide information to tags and triggers.
For example:
Built-In Variables: Predefined by GTM, such as page URL, click ID, or referrer.
User-Defined Variables: Custom variables like JavaScript snippets or data layer variables.
Constant Variables: Fixed values like your Google Analytics tracking ID.
Variables add flexibility to your tags and triggers by dynamically adapting to user actions or site contexts.
