"Read chapter ten tonight for homework. We will have a quiz tomorrow to check your reading comprehension," your teacher says cheerfully. But you are not feeling very cheerful. Just exactly what does "check your reading comprehension" mean? Comprehension means grasping the meaning of what you have read. In other words, it is understanding what you read.
Ask yourself some questions in order to know if you have comprehended what you have read. First of all, ask yourself, "What is the main idea of what I have read?" The main idea is the "big picture" of what the whole passage is about. Sometimes the main idea is written in the text. Other times, you have to figure it out on your own.
Can you remember the important details of the selection? Ask yourself the "5 W" questions. These are who, what, where, when, and why. If you can answer those questions about each topic, you probably have grasped the important details.