In the personal information on the forum, you can often set a few "mottos", and each sentence is displayed below. This is a signature file, and some signature files are also set as pictures or links. For example, online comments on netizens around the world:

Theme: Show wisdom and actively promote the development of cross-strait relations.

Author: Dawn wt Time: April-1313: 57: 27, 2006

Signature: seek truth from facts and proceed from reality. Not only the top, not only the book, but also the truth!

After each speech, the above "signature: seeking truth from facts, proceeding from reality." Not only the top, not only the book, but also the truth! "It must be displayed.

Just like the expert marks and links in this "Baidu Know", it can also be regarded as a signature file.