TCP and UDP are two types of data transmission protocols. TCP stands for Transmission Control Protocol and UDP stands for User Datagram Protocol. TCP is a reliable form of data transmission, meaning that the data is sent in order and retransmitted if necessary. Think of it like a package delivery service – if something goes wrong, the package is re-sent until it reaches the right place. UDP is an unreliable form of data transmission. It doesn’t guarantee that the data will be sent in order or that it will arrive at all. It is more like a postcard – there’s no guarantee that it will get where it’s going. TCP is better for data that needs to be sent in order, like web pages and email, while UDP is better for real-time applications like video streaming and gaming. Fun Fact: TCP was first proposed in 1974 and is still in use today, while UDP was created in 1980 and is still widely used.