Email is like sending a letter through the Internet instead of through the mail. Before email, people used to write letters and send them to other people through the mail or carry messages in person.
Email was invented in 1971 by a group of scientists. They wanted to make it easier to communicate with each other, so they made a program to help them send messages back and forth quickly.
At first, only the scientists could use email, but then other people started using it too. In the 1990s, almost everyone had email, so people could communicate quickly with their friends and family.
Today, people use email to send messages, pictures and documents to each other all over the world. It's a lot faster than waiting for a letter through the mail and it can also help people stay organized and keep track of their messages.