The Internet is a worldwide communication system, consisting of a series of interconnected networks and protocol layers. The Internet uses the standardised Internet Protocol suite (or IPv4) for data exchange by multiple networking protocols. These include the Transmission Control Protocol (TCP), the User Datagram Protocol (UDP), and the Internet Control Message Protocol (ICMP).
Internet service providers offer various connection speeds, these include dial-up, cable high-speed internet, fibre optic or other end-to-end connections like T1 line or DSL. A computer network can use a physical phone line to connect its nodes together,[2] or it can use a wireless radio link in order to provide more mobility. These networks can be logical, physical or a combination of the two.[3] From an end-user perspective, a network site is of limited utility if it doesn't have good connectivity. The best networks offer multiple paths that reach every node in the Internet and provide the fastest routes between any two points on the Internet.
Using browser software, Internet users access websites in a variety of ways: Some websites are accessed via an obvious link to them from an existing website. Other sites are accessible only after entering a special URL into the address bar. Users may also download programs and files, typically in the form of one or more bundle packages. Some websites are specifically designed as online stores; others offer merchandise for sale.
A website is a collection of related web pages that are interconnected by hyperlinks, usually accessed via the World Wide Web (WWW) on Internet-connected computers. Each site typically has a domain name, which is a distinct name used to refer to the website and its content, and is registered either with a top-level domain (TLD) provider or with a country code top-level domain (ccTLD) provider. Site owners purchase their domain from one of the many domain name registrars who interface directly with the TLDs. The web server associated with the site can have a few inbound links to other sites; these are often called "backlinks." A large site will have a whole network of internal pages and links, which are sometimes known as "deep links." It will also typically have multiple external pages. Various estimates put the Internet population anywhere from 700 million to more than one billion.[4]
The range of content at all these sites is enormous, comprising many millions of distinct pages. As of June 2016, Google estimated that it had indexed over 37 trillion unique web pages,[5][6] and was continuing to index at a rate of over 25 trillion a year. Google has estimated that a total of over 5 billion gigabytes of data can be stored in the world's roughly 1 billion personal computers [7][8] and at least 15% of all the information in printed books.[9] Most of this information is never published on paper.
The Internet's growth continued into the mid-1990s, when commercialization started to come into play, and it became commonplace to see Internet access available in public places such as libraries and restaurants. The World Wide Web brought with it an explosion of web-based applications known as "dot-com" sites, which are most often commercial in nature. The number of such sites has since grown to numerous trillions. The Internet has become an essential communications network for many countries and businesses.
The Internet may provide users with valuable information or entertainment, or cause them harm, depending on how it is used. A variety of websites can be accessed by a web browser, which often provides a graphical user interface (GUI), allowing access to common tasks, such as emailing a letter via Microsoft Outlook or viewing photographs from a digital camera. Some websites are largely text based: simple text-only documents can be accessed from the World Wide Web; while some websites may also have interactive features such as games or chat rooms on them where users may post messages and communicate with other users.
Conclusion
Internet is a worldwide communication system, consisting of a series of interconnected networks and protocol layers. The Internet uses the standardised Internet Protocol suite (or IPv4) for data exchange by multiple networking protocols. These include the Transmission Control Protocol (TCP), the User Datagram Protocol (UDP), and the Internet Control Message Protocol (ICMP).
Internet service providers offer various connection speeds, these include dial-up, cable high-speed internet, fibre optic or other end-to-end connections like T1 line or DSL. A computer network can use a physical phone line to connect its nodes together,[2] or it can use a wireless radio link in order to provide more mobility.
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