USB headsets are over-the-ear or on-ear headphones or in-ear earphones with a microphone. Many gaming headsets are also USB headsets. The USB connectivity of these headphones is superior to the 3.5mm connector as it allows more bandwidth and can be used to serve surround sound.
Earphones are a type of headphone that have small speakers that either rest in the ear or fit inside the ear canal. Earbuds and In-Ear headphones are the two most common types.