The European Internet Accessibility Observatory is like a big computer that helps people with disabilities use the internet. It looks at lots of different websites and checks if they are easy to use for people who may have trouble seeing or hearing, or who have trouble moving their hands or using a mouse.
The Observatory also helps people who make websites learn how to make them better for everyone. It tells them what changes they can make to the website so that it works better for people with disabilities.
It's like having a big helper who makes sure everyone can use the internet and not feel left out.