A signature file, also called an email signature or footer, can be defined as a block of text appended to the end of an email message. This text can contain the sender's name, contact details, and other relevant information. Synonyms for signature file include email signature, signature block, signature stamp, signature line, email footer, and sign-off. These terms are often used interchangeably, but they all refer to the same thing - a personalized message attached to an email or other digital communication. Whatever you choose to call it, a signature file can help to promote your professional image and make your emails more memorable.