Gmail & Google Workspaces currently allow you to add a “+” symbol to the end of your email address followed by any text you like. This effectively gives you a new email address to use but is delivered to your normal inbox.
It’s a great feature to allow you to test with different emails addresses without the need of having a sperate account setup.
Example:
myemail@email.com
Can become
myemail+additionaltext@email.com
Both delivered to the same inbox.