The internet is a network of computer networks. Big networks connect to each other and also to lots of small networks. The World Wide Web and the internet are not the same thing. The origins of the internet go back to the creation of the Advanced Research Projects Agency Network (ARPANET) by the United States Department of Defense back in 1969, whereas the World Wide Web dates from the 1989 to 1990 time frame. The internet uses a protocol suite known as TCP/IP, where TCP stands for Transmission Control Protocol and IP stands for Internet Protocol. The TCP is responsible for bidirectional data transmissions between two distributed applications on a network. The IP is responsible for actually making sure that individual packets get from the sender to a receiver. A Media Access Control (MAC) address is an address that is assigned to a physical device, normally at the time the device is manufactured.