Backward compatibility

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Backward Compatibility is the capability of transfer systems to accept and/or offer data through older systems. This makes it possible to upgrade a certain piece of technology involved in a greater system without compatibility issues.
For example, the Universal Serial Bus technology for computers has been updated numerous times, but sockets have always been compatible with all versions, and almost all plug-in devices (except for 3.x type-B) have been compatible with the all other sockets.[1]