Files that contain the .sig file extension are small text files that contain an email "signature" that has been created by an email user. These files can be automatically attached at the end of a user's email messages, allowing them to send emails without having to retype the signature information each time the email is sent.
SIG files are often used for business emails and normally contain the name of the user, their email address, the name of the company they work for, their title and their contact information. In some instances people will use SIG files for personal emails, including their name, email address and a personal statement at the bottom of each email.
Many email programs allow a user to create multiple SIG files. The user can then choose which sig file to use when sending an email, or they may choose not to attach any signature at all.
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