First of all, the Internet. The Internet is a large collection of different networks that use certain common protocols and provide certain common services. In this section, they go into detail about the history, how it started as a military project, and also talk about how users get access to the modern version via ISP (Internet Service Provider). For our second example, the author talks about third generation, or 3G, mobile phone networks. Initially implemented in 2001, this system offers both digital voice and broadband digital data services. An advantage of this system is the mobility that comes from the ability of data to be transferred from one cell tower to another