The internet is a global network of interconnected computer networks that allows computers to communicate with each other. It's made up of a variety of networks, including private, public, academic, business, and government networks.

The internet, sometimes simply called the net, is a worldwide system of interconnected computer networks and electronic devices that communicate with each other using an established set of protocols.

Here are some key facts about the internet:

• How it works

  The internet uses a set of protocols, or languages, to transmit information. Data is translated into pulses of light or electricity, known as "bits", and then interpreted by the receiving computer.

• How it started

  The internet originated in the 1960s as a way for government researchers to share information. The Advanced Research Projects Agency (ARPA) of the U.S. government conceived the idea, and the first known packet-switching network was called ARPANET.

• How it became the internet

  On January 1, 1983, ARPANET and the Defense Data Network officially changed to the Transfer Control Protocol/Internetwork Protocol (TCP/IP) standard, which allowed different types of computers to communicate with each other.

• What it's used for

  The internet carries a wide range of information resources and services, including the World Wide Web (WWW), electronic mail, internet telephony, and file sharing.

• How it's accessed

  You can access the internet using a web browser, which displays websites stored on the internet.

The internet has also led to the development of the Internet of Things (IoT), which involves connecting and controlling devices via the internet.

History of the Internet

The Internet came in the year 1960 with the creation of the first working model called ARPANET (Advanced Research Projects Agency). It allowed multiple computers to work on a single network which was their biggest achievement at that time. ARPANET uses packet switching to communicate multiple computer systems under a single network. In October 1969, using ARPANET first message was transferred from one computer to another. After that technology continues to grow.

How is the Internet Set Up?

The internet is set up with the help of physical optical fiber data transmission cables or copper wires and various other networking mediums like LAN, WAN, MAN, etc. For accessing the Internet even the 2G, 3G, and 4G services and the Wifi require these physical cable setups to access the Internet. There is an authority named ICANN (Internet Corporation for Assigned Names and Numbers) located in the USA which manages the Internet and protocols related to it like IP addresses.

How Does the Internet Work?

The actual working of the internet takes place with the help of clients and servers. Here the client is a laptop that is directly connected to the internet and servers are the computers connected indirectly to the Internet and they are having all the websites stored in those large computers. These servers are connected to the internet with the help of ISP (Internet Service Providers) and will be identified with the IP address.

Each website has its Domain name as it is difficult for any person to always remember the long numbers or strings. So, whenever you search for any domain name in the search bar of the browser the request will be sent to the server and that server will try to find the IP address from the Domain name because it cannot understand the domain name. After getting the IP address the server will try to search the IP address of the Domain name in a Huge phone directory that in networking is known as a DNS server (Domain Name Server). For example, if we have the name of a person and we can easily find the Aadhaar number of him/her from the long directory as simple as that.

So after getting the IP address, the browser will pass on the further request to the respective server and now the server will process the request to display the content of the website which the client wants. If you are using a wireless medium of Internet like 3G and 4G or other mobile data then the data will start flowing from the optical cables and will first reach towers from there the signals will reach your cell phones and PCs through electromagnetic waves and if you are using routers then optical fiber connecting to your router will help in connecting those light-induced signals to electrical signals and with the help of ethernet cables internet reaches your computers and hence the required information.

What is an IP Address?

IP Address stands for Internet Protocol Address. Every PC/Local machine is having an IP address and that IP address is provided by the Internet Service Providers (ISPs). These are some sets of rules which govern the flow of data whenever a device is connected to the Internet. It differentiates computers, websites, and routers. Just like human identification cards like Aadhaar cards, Pan cards, or any other unique identification documents. Every laptop and desktop has its own unique IP address for identification. It’s an important part of Internet technology. An IP address is displayed as a set of four-digit like 192.154.3.29. Here each number on the set ranges from 0 to 255. Hence, the total IP address range from 0.0.0.0 to 255.255.255.255.

You can check the IP address of your Laptop or desktop by clicking on the Windows start menu -> then right-click and go to network -> in that go to status and then Properties you can see the IP address. There are four different types of IP addresses are available:

1. Static IP Address

2. Dynamic IP Address

3. Private IP Address

4. Public IP Address

World Wide Web (WWW)

The world wide web is a collection of all the web pages, and web documents that you can see on the Internet by searching their URLs (Uniform Resource Locator) on the Internet. For example, www.geeksforgeeks.org is the URL of the GFG website, and all the content of this site like webpages and all the web documents are stored on the world wide Web. Or in other words, the world wide web is an information retrieval service of the web. It provides users with a huge array of documents that are connected to each other by means of hypertext or hypermedia links. Here, hyperlinks are known as electronic connections that link the related data so that users can easily access the related information hypertext allows the user to pick a word or phrase from text, and using this keyword or word or phrase can access other documents that contain additional information related to that word or keyword or phrase. World wide web is a project which is created by Timothy Berner’s Lee in 1989, for researchers to work together effectively at CERN. It is an organization, named World Wide Web Consortium (W3C), which was developed for further development in the web.

What is DNS?

The Domain Name System (DNS) maps IP addresses to hosts connected to either the public or private internet via a process called DNS resolution, making it an essential part of an organization’s infrastructure. It not only allows users to easily search for and access websites or other publicly available services, but also facilitates communication between hosts on a local network.

How does DNS resolution work?

Most hosts on a network (internal or external) have both a unique IP address and a hostname. Hostnames comprise the host’s local or subdomain(s), its parent domain name, and its domain extension (e.g., .com, .org, .net). Together, these segments provide hosts with an accessible identity for clients to interact with.

An application's hostname serves as a unique identifier that users can easily search for.

There are a number of third-party DNS providers available for the internet, including internet service providers and platforms like Google and Cloudflare. Enterprise-level providers can support private networks, though organizations also have the ability to spin up local DNS servers for greater control over their internal requests. When a client searches for a hostname—typically through a web browser—their network’s DNS provider executes a multi-step resolution process via the following four servers in order to find and return the appropriate IP address:

1. DNS recursor

Serves as the middleman between a client and the other DNS servers, following a chain of referrals from each one until it locates the requested host’s IP address. The recursor will also cache information in order to respond faster to subsequent client requests.

2. Root nameserver

Receives the first request from the DNS recursor and sends back the appropriate top level domain (TLD) server, based on the queried host’s domain extension.

3. TLD server

Maintains information for all domain names with the same domain extension. A TLD server receives the next request from the DNS recursor and responds with the appropriate authoritative nameserver.

4. Authoritative nameserver

Stores the DNS records that map domain names to IP addresses. The authoritative nameserver responds to a DNS recursor’s final request with the queried hostname’s IP address. If the IP address is not available, the nameserver will throw an error.

As a final step in the DNS resolution process, the DNS recursor sends the IP address back to the client’s browser, allowing it to connect to and load the appropriate website or application.