Think about it as an automated volume control. The compressor lowers the volume of the input signal if its level goes beyond a certain threshold. With side-chain compression, the compressor uses the level of a different signal (the one connected to its side-chain input) to determine when to lower the volume of its input signal.
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https://www.youtube.com/watch?v=ruKdsKWJiZA
Think about it as an automated volume control. The compressor lowers the volume of the input signal if its level goes beyond a certain threshold. With side-chain compression, the compressor uses the level of a different signal (the one connected to its side-chain input) to determine when to lower the volume of its input signal.