Explain what is GPL v3?

The GNU General Public License (GPL) is the most extensively and popularly used free and open source software (FOSS) license in the world. The GPL was originally created as well as sponsored by the Free Software Foundation (FSF). It is now one of the most widely used free software license, which guarantees end users the freedom to run, study, share and modify the software.

The GPL is a copyleft license- this means that derivative work can only be distributed under the same license terms. In addition to clarifying the rules about licenses that are already compatible with the older version of GPL, GPLv3 is also newly compatible with a few other licenses such as the Apache License 2.0. Besides this, GPLv3 also affords its users more advanced defenses against patent aggression than any other free software license.