The Mozilla Public License (MPL) is a free software license developed by the Mozilla Foundation. It allows developers to use, modify, and distribute software while ensuring that any changes made to the original code are also shared under the same license. This promotes collaboration and transparency in software development. MPL is considered a "file-level" license, meaning that modifications to files can be kept separate from the rest of the project. This flexibility makes it easier for developers to integrate MPL-licensed code with other software, fostering innovation while protecting the original authors' rights.