Transmission control protocol (TCP) and user datagram protocol (UDP) both have advantages and disadvantages. TCP is better for torrenting and everyday usage because it verifies the order, receipt, and sanctity of every packet, so you won't end up downloading half of a photo.
However, UDP doesn't have that verification, meaning data can flow more quickly, but a packet may occasionally lose its way. It's nothing to be concerned about—it just means it's much better for streaming your favorite shows or playing games online.