Definition: A coursebook, a formal manual of instruction in a specific subject, especially one for use in schools or colleges.

Alright class, settle down and let’s take a look, At the word “textbooks,” what exactly they cook! The dictionary's right, it gives us the key, A "coursebook" is part of what you see. It’s more than just words on a page, you know, A formal manual, helping knowledge grow. Think of it like this: a guide so bright, To help you learn with all your might! Specifically for schools and colleges too, Teaching subjects – old and new! Like math or science, history's tale, Textbooks are there to never fail. They’re structured lessons, neatly planned, A helpful tool throughout the land! So “textbook” means a learning friend, To guide your studies 'til the very end! Do you have any questions for me now?