A transcompiler is like a magic machine that can take one type of code and turn it into another type of code without changing what the code does. It's like if you had a book written in Spanish and the transcompiler could turn it into English so you could understand it better.
For example, let's say you wrote some code in a programming language called JavaScript, but you wanted to use it in a different programming language called Python. You could use a transcompiler to turn your JavaScript code into Python code so that it works the same way, but now you can use it in Python too!
Transcompilers are helpful because they save time and effort. Instead of having to rewrite your code in a new programming language from scratch, you can just use a transcompiler to do it for you. It's like the transcompiler is doing all the hard work so you don't have to.
So, a transcompiler is a cool tool that helps you turn one type of code into another type of code, saving you time and effort.