Codecs come in many varieties with different advantages, but their main purpose is organizing media data that's stored in a container. They are essentially the order of data from an audio or video file, and they allow the data to be played back, edited, or transcoded, which is changing the codecs. However, they are different from a container, because containers are the space where audio and video codecs are held in a single file. Some containers are particular with the codecs they hold, whereas others are compatible with a variety of audio and video data. In addition, containers have the ability to hold metadata on the file they're carrying, which gives information about the video, such as the frame rate, the camera and lens used, and specific production standards.
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