A container or wrapper format is a meta-file format whose specification describes how data and meta-data is stored. A program able to identify and open a container file might not be able to decode the contained data. This can be caused by the opening program lacking the required decoding algorithm, or the meta-data not providing enough information.By definition, a container format could wrap any kind of data. Though there are a few examples of such file formats , most container formats are specialized for the specific requirements of the data. For example, a popular family of containers is found among multimedia file formats. Since audio and video streams can be coded and decoded with many different algorithms, a container format can be used to provide a single file to the user.

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