MikuMikuDance (MMD) is a free animation software that allows users to create 3D animations using models, primarily featuring characters from the Vocaloid franchise, such as Hatsune Miku. It provides tools for users to manipulate models, add movements, and create custom animations, making it popular among fans and creators. The software supports various file formats and allows for the import of user-created models and accessories. Users can also add music and effects to enhance their animations, fostering a vibrant community that shares creations online. MMD has become a significant platform for fan art and animation within the Vocaloid community.