It splits your audio into different frequency bands and lets you apply compression to each band separately. So you can really fine-tune the compression settings for different parts of your track, like the lows, mids, and highs.
And like others have said, Maximus also comes with some sick features like stereo imaging and saturation. It helps you widen your sound and make it feel more spacious. Plus, it adds some warmth and grit with its saturation options, giving your tracks that extra flavor they need.