We are going to explain to you how to log out of Gmail, both on the mail service website and in its mobile application. In this way, if you want to stop using this account in your email, you can close the session and start it with another new account.
On mobile this is somewhat complex, since will be logged out at device level, which means that the account will be closed in various Google apps. In the specific case of Android, it is not advisable to log out of your main account in order to continue using your mobile normally.