Avalokitesvara is a very special person in Buddhism. Imagine you have a really big brother or sister who always looks after you and makes sure you are safe and happy. Well, Avalokitesvara is like that, but for everyone in the whole world!
Avalokitesvara is often shown as a kind and gentle person with many arms and eyes. The many arms show that they can help lots of people all at once, and the many eyes show that they can see everything that's happening and always be there to help.
People who follow Buddhism think that Avalokitesvara is always listening and watching, and that they can hear everyone's prayers and see everyone's problems. People might pray to Avalokitesvara if they are feeling sad, scared or worried, or if they know someone who needs help.
So, in short, Avalokitesvara is a very special and helpful person in Buddhism, who is always there to take care of people and listen to their problems, just like a big brother or sister would.