What is the difference between Opacity and Target Strength?

What is the difference between Opacity and Target Strength?

From the docs:

Opacity is the transparency or amount of texture applied for a given amount of time you paint

Target Strength is the maximum opacity you can reach by painting continuously.

opacity like a power of brush - with more value it creates greater brush trail

target strength is a value that this brush left on terrain. for example. set it to 0.5 and paint - your paint will have 50% of texture you paint and 50% of what there was before painting