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Long sightedness, also called hypermetropia, is a problem with your vision. It is often inherited. It can also be linked to other eye conditions, like a squint, but sometimes you can be long sighted and no one knows why!
You can usually see things far away better than you can see things close up if you are long sighted. For example, you might be able to see the television very clearly, but find it hard to read a book.
If your vision is normal, when you look at things, light is focused sharply onto your retina at the back of your eye. But, if you are long sighted, you can usually only focus the light from something you are looking at in the distance. You will find it hard to focus the light from something that is close to you. What happens is that the light focuses to a point behind your retina instead, and your vision is blurred. If you move something further away from you, the focus point of the light will move forwards onto your retina and you can properly see what you are looking at.
You should make sure you have an eye test once every year or two, so that if you become long sighted, you can be diagnosed and treated as soon as possible. This will stop you from having problems at school if you start finding that you can't see properly.