This fifteen-page undergraduate research paper discusses TCP/IP, its foundations, advantages and strengths, disadvantages and weaknesses, and its security issues. TCP/IP, although flawed in some respects, has gained immense popularity among computer users, and is currently on almost every desktop in the world. Its success has been essential to that of the Internet, and it has been called the backbone of the Internet itself. 15 pgs. Bibliography lists 15 sources.