If you use your headphones while on-the-go, in-ears or earbuds can be a lot more portable than bulky over-ears and help passively block out background noise. They can be great to use at the gym and are easy to toss into your pocket when you get off the bus or arrive at the office. While technically earbuds rest at the edge of the ear canal and in-ears have barrel-shaped tips that are inserted deeper into the ear, the two terms are often used interchangeably. In-ears tend to be more common, though some people find them uncomfortable and prefer the less intrusive fit of earbuds.