Magic in Middle-earth is a very special kind of power that some people or creatures have. Just like how some people are really strong or really smart, some people have the ability to use magic.
There are different kinds of magic in Middle-earth, and they come from different sources. Some people have magic because they are born with it, like Gandalf or Saruman. They are called wizards, but they are not like the wizards you see in fairy tales who wear hats and have long beards. They look just like normal people, but they have special powers.
Other creatures like elves also have magic, and they get their power from the environment around them, like trees, rivers, and mountains. They can use their magic to do things like heal wounds or make beautiful music.
One of the most powerful kinds of magic in Middle-earth is the magic of the ring. There are special rings that were made a long time ago that have the power to control people and make them do things they don't want to do. If you wear the ring, you can become invisible, but it also makes you vulnerable to being controlled by the dark lord Sauron.
Magic can be both good and bad in Middle-earth, just like everything else. Some people use their magic to help others, while others use it for evil purposes. And just like how it's important to be careful with fire or knives, it's important to be careful with magic too, because it can be dangerous if it's not used wisely.
So that's magic in Middle-earth - it's a special power that some people or creatures have, and it can do amazing things and be both good and bad.