• The Internet is a network of networks or interconnected networks
    • The Internet consists of many different networks, with each network being composed of smaller networks within it.
    • There are different ways to logically group the networks that comprise the Internet.
      • By function: networks can be grouped by the function or service they provide; for instance, the World Wide Web and Internet Relay Chat (IRC) are distinct from each other and even require different kinds of software to access.
      • By geographic location: residents in the Philippines connect to one of the local Internet Service Providers (ISPs). Each ISP has its own network.
    • All the different devices and applications on all the different networks can communicate because every thing we send and receive over the Internet is converted into signals that follow a system of rules and converted back into a form that we can understand.
  • The Internet is where you can find the World Wide Web
    • The World Wide Web is what many people think of when they think of the Internet, but the Web is only part of a bigger picture.
    • There are many other networks on the Internet, and each network is typically accessed with software created for that network. One example is IRC, a chat network popular among Filipinos in the mid-1990s to the early 2000s. The most popular software for accessing IRC was mIRC. ICQ and Yahoo! Messenger were other popular chat networks.
    • Multiplayer online games are also part of the Internet; a team can be composed of players who are geographically very distant from each other.
  • The Internet lets people communicate globally through email, chat and social media
    • The Internet is a network of networks, which facilitates global communication. Email was one of the first methods of communication on the Internet; chat networks were popular among Filipinos for several years. Social media, with its integration of one-to-one/group instant messaging features is now a big communication medium.
    • People used to depend on expensive international calls to get in touch with family abroad; social media apps today have integrated voice and video calling, reducing cost.
  • The Internet is a source of information and entertainment such as movies, music and games
    • Many individuals and organizations have worked to make the collected knowledge of the world available on the Internet. Different kinds of information can be accessed by anyone with an Internet-connected device, on a wide variety of topics such as music, art, engineering, science and other fields of study.
    • Some social media apps and sites allow uploading and sharing of videos.
    • There are sites that offer streaming services for a monthly subscription fee, where you can watch movies and episodes of TV shows to your heart’s content.
    • Other sites function like an Internet-based radio, where users ‘tune in’ to listen to music. Some of these are free, supported by ads; some sites provide free streaming but also accept monthly subscriptions for an ad-free experience.
    • Games are available on the Internet, from many different sites. Some are completely free, others are free but require payment for certain features or to remove ads; still others require payment before you can even download and install.
  • The Internet came out of a desire to construct a computer network that could survive military attacks
    • The United States federal government commissioned research to build communication networks that could cope with failures in one or more sites.
    • The precursor to the Internet was ARPANET (Advanced Research Projects Agency Network) which originally served to interconnect U.S. regional academic and military networks.