Binoculars are like two little telescopes that you hold up to your eyes to see things that are far away. They have two lenses, one for each eye. That's why they're called binoculars, because they have two 'oculus' (latin for eyes). These lenses work together to make faraway things look closer and bigger.
Inside the binoculars, there are even more lenses that help make the image you see clear and crisp. Binoculars can be adjusted so that you can see faraway things clearly, even if they're moving around. You can also adjust the distance between the lenses to make them fit your eyes perfectly.
Binoculars come in different sizes, from small ones that you can easily carry in your pocket to big ones that are used for bird watching or just seeing things from really far away. They also come in different levels of quality, from cheap ones that you can buy at toy stores to expensive ones that are used for scientific research or hunting.
So, to sum it up: binoculars make faraway things look closer so you can see them better, and they come in different sizes and quality levels.