Multimedia containers are file formats that can hold various types of data, such as audio, video, and subtitles, all in one file. They organize and synchronize these different media types, making it easier to play or share them together. Common examples of multimedia containers include MP4, AVI, and MKV. These containers are essential for digital media because they allow for efficient storage and playback. By using a multimedia container, users can enjoy a seamless experience without needing separate files for each media type. This versatility is crucial for streaming services and personal media libraries alike.