The About command shows the About window, which displays information about the version of GIMP you are running and the many authors who wrote it.

This dialog also shows the Check for updates button that you can use to manually check whether you have the latest version of GIMP. If you have enabled automatic update checking, then this box may show you that a new version of GIMP is available. In that case the button will allow you to go to the newest download for GIMP.

12.11.2. ダイアログウィンドウのご説明

図16.244 「GIMP について」ダイアログのウィンドウ

The Credits button shows a list of people that have contributed to GIMP as developers, documenters and artists.

The License explains how to get the license.