Datagram transport layer security is a type of technology used to protect any information sent over the Internet. It helps to make sure that the data you send is seen only by the person you send it to, and it is not seen by anyone else.
It works by using a special code called an 'encryption key'. This encryption key is like a secret code that scrambles the data you send so that only people that have the same key will be able to unscramble or decrypt the data. This prevents anyone else that is not authorized to see the data from seeing what it is.
Essentially, datagram transport layer security helps you to keep your personal information safe while using the Internet.