Signatures allow you to append common text to the bottom of all e-mails you send out, without having to retype that information into each individual mail message.
Some people like to include something fun like a favorite quote.
Others will include their full name, e-mail address, Web site address, and phone number. It can be anything you want. Just remember that e-mails often get forwarded to others, so don't include anything you don't mind the whole world reading. Enter the text for your signature. Save the file, name it something obvious like sig.txt , then launch your e-mail program or Web browser.