If you don't sign in to your webmail account, the account and all the email contained inside it may get erased. It will keep your data save for some time after deleting it. But u can still see something on the Google search result. Like, Facebook if u request FB to delete your account then they will take 90 days to delete your account data. However, deleting the Gmail account is a simple process as you can delete it by navigating the settings of Gmail.
Some questions asked by Gmail users-
How can I restore my Gmail account?
How do I permanently delete my Gmail account?
Can I recover a deleted Gmail account?
How can I reactivate my deleted Gmail account?
Can I recover permanently deleted Gmail?
Can you delete a Google account?
What happens after deleting Gmail account?
How do I delete an email account from Gmail?
