What is a signature file?

When sending emails to relatives, friends, classmates, clients, etc., you can add your own electronic business card to the email. This electronic business card is the signature file. You can design personalized business cards or email signature files online through the official mobile network disk website. In Baidu Tieba, you can also use signature files. You can add some of your favorite signature pictures or emails to help others get to know you. In QQ space, there is also a signature file function. When leaving a message for others or posting a diary yourself, you can choose whether to use a signature file to show your unique personality.