Temporary directory

In computing, a temporary folder or temporary directory is a directory used to hold temporary files. Many operating systems and some software automatically delete the contents of this directory at bootup or at regular intervals, leaving the directory itself intact.

For security reasons, it is best for each user to have their own temporary directory, since there has been a history of security vulnerabilities with temporary files due to programs incorrect file permissions or race conditions.
— Wikipedia

Personally I use it to move files which are not required anymore and can be deleted in the future. I also have Inbox subdirectory here, where I store some data which I’ll process later.