Why do we have to use 'data'?

i was doing the node.js course on user I/O. I am supposed to make the system ‘read’ the input from user by doing this: process.stdin.on(‘data’, playGame); (playGame is the call back function)
however, I am wondering if I have to use the event name ‘data’? (it was prompted error when i use anything else as the event name)