So, Eiffel is a language that people use to tell computers what to do in a special way. It's like you have a secret code that the computer can understand and do what you want it to do.
The reason it's special is that when you write code in Eiffel, the computer checks it really carefully to make sure everything makes sense and should work correctly.
It's sort of like if your teacher checked your homework after you finished it. The computer is checking your code to make sure it's correct before it runs it.
This can help to catch errors before they cause any problems, which is really important because sometimes errors can make the computer do things you didn't want it to do.
So, Eiffel is like talking to the computer in a secret code, but a really safe secret code that the computer checks before it does anything.