A sync license, short for synchronization license, is a legal agreement that allows the use of a piece of music in conjunction with visual media, such as films, TV shows, or commercials. This license is necessary because it ensures that the original creators of the music are compensated for their work when it is paired with visual content. Obtaining a sync license typically involves negotiating terms with the copyright holder, which could be the artist, record label, or music publisher. The fee for a sync license can vary widely based on factors like the popularity of the song and the scope of its use in the project.