The GNU's General Public License, a commonly-used free software license. The GPL has various versions, v1-v3, so use this tag only for questions talking about overarching issues of the licenses or shared characteristics. For example, for a question about a unique section on version 3, use the [gpl-3] tag.
The GPL, or General Public License is a basic software license offered by GNU, which is sponsored by the Free Software Foundation. There are currently three major versions of the license: 1, 2, and 3.