Cross-origin resource sharing

Cross-origin resource sharing, also known as CORS, is like asking your friend for a toy that they have and they are in a different house than you. When you want to play with their toy, you need their permission to bring the toy to your house. Similarly, when a website wants to access information from another website that is not in the same "house" or same origin, it needs to ask for permission to access that information.

The "house" or origin is the domain or server where a website's resources are hosted. For example, if a website is hosted on "www.example.com" and it wants to access information from "www.otherwebsite.com," they are in different houses or origins.

CORS is important for security reasons, because it stops just any website from accessing information that is not theirs to use. It is like having a fence around your yard to keep unwanted visitors out.

Without CORS, a website could access information from any other website, including private information like passwords or credit card numbers, which would be very dangerous.

To allow a website to access information from another website, the owner of the website hosting the information must set rules to allow certain websites to access it. It is like the owner of the toy telling their friend that they can borrow it, but not anyone else.

In summary, Cross-origin resource sharing (CORS) is like asking permission to borrow a toy from a friend who is in a different house. It is important for security, because it allows websites to access information only when permission is granted.