What is Audio Cleaning, Retiming, Enhancement?

Is process tha make your audio files :

• More high headroom
• More Rythm Groove
• More High RMS and Low Peak

With this process we reduce dynamic range, the span between the softest and loudest sounds, so we can make your tracks sound more polished by controlling maximum levels and maintaining higher average loudness, make it more natural sounding and intelligible without adding distortion, resulting in a song that’s more “comfortable” to listen to.