There are cases when users handle business programs and it is much required for them to add a signature with their name which also includes their business address. Thus Google brings the option of Signature where How to Add Signature to Gmail one can choose to add a signature for selected mails or for all emails which are to be composed or replied to. There are cases when users handle business programs and it is much required for them to add a signature with their name which also includes their business address. Thus Google brings the option of Signature where one can choose to add a signature for selected mails or for all emails which are to be composed or replied to.