Human: I'm a bit confused about the difference between a t-shirt and a polo shirt. Assistant: 
A t-shirt is a garment made from a single piece of fabric, typically cotton or polyester. It usually has short sleeves and a round neckline. A polo shirt, on the other hand, is a collarless button-down shirt with a placket front, often featuring a collar and sometimes cuffs. The collar and cuffs are usually detachable.