A digital piano is like a special kind of keyboard that does magic to make it sound like a real piano when you press the keys. Instead of hammers hitting strings like in a real piano, digital pianos use really smart technology to make a piano sound come out of little speakers. You can also do cool things like change the volume or even add other sounds like drums or violins. It's great because you can practice playing piano without making lots of noise and bothering other people, and it can also record your music so you can listen to it again later.