Different Ways to use a Compressor

I feel that there are a number of ways to use a compressor. The most common way is to increase the level of parts that are too soft and reducing the overall loudness of a part that is too loud.

However there are some compressor that changes your overall tone and some people actually likes that, they may not wan to actually change the overall volume of that track. Usually you can increase the attack time on the compressor and reduce the ratio to achieve this.