What Are the Differences Between Brush Plates and In-Wall Cable Entry?

I’ve learned about in-wall cable entry, but I’ve also heard that brush plates are quite useful. What are the distinctions between brush plates and in-wall cable entry, and in what scenarios would it be more suitable to use brush plates?

There are various kinds of in-wall cable entry in the market. What kind of in-wall cable entry are you referring to specifically? Can you provide a picture?