Copyleft licenses are a type of licensing used primarily in the realm of software and creative works. They allow users to freely use, modify, and distribute a work, as long as any derivative works are also shared under the same license. This ensures that the original creator's intentions for openness and sharing are preserved, promoting collaboration and innovation. One of the most well-known examples of a copyleft license is the GNU General Public License (GPL). By using this license, developers can protect their work while encouraging others to contribute and improve upon it, fostering a community-driven approach to software development and creativity.