Transmission Control Protocol / Internet Protocol (TCP/IP) is the name for a pair of communication protocols that underpin the internet. IP is the lower-level protocol of the two, and this deals with routing packets to their correct destinations. IP can run on top of many different lower-level protocols (such as Ethernet), and it is where IP addresses come from.
TCP is a layer above IP, and it is concerned with the reliable delivery of packets and flow control. TCP is where ports come from, such as port 80 for HTTP, and port 443 for HTTPS. There is also the User Datagram Protocol (UDP), which can be used instead of TCP, but it provides fewer features.
HTTP runs on top of TCP, and it is usually what you will deal with in a web application. ...
