C++/OpenGL: How does Tesselation work?

I've got the book "OpenGL SuperBible Seventh Edition" and I'm now wondering how the tesselation works? I'm currently in chapter 3 of the book and I do not really understand the explanation of the tesselation with the tesselation control shaders, the tesselation engine and the tesselation evaluataion shaders.

So I'm using

• OpenGL 4.5
• C++11
• Windows

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So can anyone explain to me in detail how tesselation works in OpenGL 4.5 and what control points, batches etc. are?

Thx in advance. ShadowDragon