{"id":24103,"date":"2023-02-10T19:00:28","date_gmt":"2023-02-10T18:00:28","guid":{"rendered":"https:\/\/www.sciencefocus.com\/?p=135120"},"modified":"2023-02-10T19:35:16","modified_gmt":"2023-02-10T18:35:16","slug":"how-the-internet-works-the-intriguing-science-of-how-your-device-is-able-to-load-this-sentence-right-here","status":"publish","type":"rss_feed","link":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/rss_feed\/how-the-internet-works-the-intriguing-science-of-how-your-device-is-able-to-load-this-sentence-right-here\/","title":{"rendered":"How the internet works: The intriguing science of how your device is able to load this sentence right here"},"content":{"rendered":"

Around 65 per cent of the global population has access to the internet, but how does it work to find and retrieve data? <\/p>

By Dr Peter Bentley\n \t\t<\/p>

Published: Friday, 10 February 2023 at 12:00 am<\/p>

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The\u00a0internet<\/a> is a collaboration between\u00a0computers\u00a0all over\u00a0the world (although some countries restrict access). When you type in a URL (uniform resource locator, or\u00a0web address) such as https:\/\/www.sciencefocus.com<\/a>, your computer\u00a0first\u00a0has to figure out which computer to talk to\u2026<\/p>\n

1.<\/strong> Every computer has a unique IP (internet protocol) address, consisting of sets of numbers separated by dots. To find the right IP address from the URL, your computer first talks to DNS (domain name system) servers, which pass the request up a hierarchy until each set of numbers has been resolved to get the IP address.<\/p>\n

2.<\/strong> Your computer now starts to establish a connection to that address, a process that involves a chain of computers all passing data between your computer and the server that hosts the website you want. The chain is optimised to minimise the number of steps and potential errors, giving you the fastest, most reliable speed.<\/p>\n

3.<\/strong> Once the connection is made, your computer can talk to the server, which will provide the data you want \u2013 a funny cat video, for example. They both speak the language of the internet: TCP\/IP (transmission control protocol\/internet protocol). Little packets of data are sent in this language that\u2019s been specially designed to check for errors and ensure all the data arrives correctly.<\/p>\n

Your computer also knows that the server follows the HTTPS (hypertext transfer protocol secure) protocol \u2013 the first part of the URL \u2013 so when it puts the packets together and sees an HTML (hypertext markup language) web page, it knows how to display the content.<\/p>\n

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How does the internet actually work? \u00a9 Dan Bright<\/span><\/figcaption><\/div>\n

4.<\/strong> Today\u2019s web pages are often very complicated. Their HTML code may specify content stored on other computers, each with their own domain names, so as your computer displays the content, it has to keep asking the DNS servers \u2018where is this?\u2019 and quickly establishing new connections to other computers.<\/p>\n

Sometimes your computer asks more complicated questions, such as: \u2018what is being said in this audio recording taken from my user\u2019s Alexa<\/a> device?\u2019 The servers then have to perform complex artificial intelligence<\/a> processing and reply with the result.<\/p>\n

5.<\/strong> All of this communication happens dynamically across the world, with servers providing data through whatever connections are available, making the internet amazingly robust.<\/p>\n

Read more:<\/strong><\/p>\n