What is the difference between earphones and headphones?

Both earphones and headphones allow users to listen to audio from an input device. Their primary difference is in their form factor. Earphones tend to go inside your ears, while headphones sit on your ears (on your head). 

Earphones are usually smaller and more portable, while headphones tend to have better sound quality and battery life, as they are larger and can fit more parts and larger batteries inside. Depending on your needs, either would be a good choice for listening to audio.