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📖 Paper 1 · Topic 4: Computer Networks
4.3b The Internet — WWW, Search & HTML
Edexcel 1CP2 · GCSE Computer Science · ~9 min read · 🔒 Pro
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⭐ Enrichment lesson — this topic is not assessed in the Edexcel 1CP2 GCSE exam. It provides valuable extra knowledge but should not replace revision of the core specification.

The Internet vs the World Wide Web

Students frequently confuse these two terms. They are not the same thing:

TermDefinition
The InternetA global network of interconnected computers and devices using TCP/IP protocols. The physical infrastructure — cables, routers, servers.
The World Wide Web (WWW)A service that runs on top of the internet — a collection of web pages (HTML documents) linked by hyperlinks and accessed via browsers using HTTP/HTTPS.

Analogy: The internet is like the road network; the WWW is like the cars and buildings that use those roads. Email, FTP, and online gaming also use the internet but are not part of the WWW.

How the Web Works

  1. User types a URL (e.g. https://www.bbc.co.uk) into a browser
  2. DNS lookup — DNS server translates the domain name into an IP address
  3. Browser sends an HTTP/HTTPS request to the web server at that IP address
  4. Web server responds by sending the HTML, CSS, and JavaScript files
  5. Browser renders (displays) the web page to the user

Web Browsers

A web browser is client-side software that requests, receives, and displays web pages. Examples include Chrome, Firefox, Safari, and Edge. Browsers:

  • Interpret HTML (structure), CSS (style), and JavaScript (behaviour)
  • Manage cookies and browsing history
  • Provide address bar, bookmarks, and navigation controls

Search Engines

A search engine is software that indexes the web and returns relevant results in response to user queries. Examples: Google, Bing, DuckDuckGo.

Search engines work by:

  1. Crawling — automated programs called spiders/crawlers follow links across the web, discovering new and updated pages
  2. Indexing — content of discovered pages is stored in a massive database (the index)
  3. Ranking — when a user searches, an algorithm ranks pages by relevance (based on keywords, links to page, site authority, etc.)

HTML, CSS, and JavaScript

LanguagePurposeExample
HTMLDefines the structure and content of web pages using tags<h1>Heading</h1>, <p>Paragraph</p>
CSSControls the visual appearance (colour, font, layout, spacing)color: blue; font-size: 16px;
JavaScriptAdds interactivity and dynamic behaviour to web pagesForm validation, animations, loading data

URLs and Hyperlinks

A URL (Uniform Resource Locator) is the address of a specific resource on the web. Structure: https://www.example.com/page?query=value

  • https:// — protocol
  • www.example.com — domain name (converted to IP by DNS)
  • /page — path to specific resource

A hyperlink is a clickable link in a web page that navigates to another URL. Hyperlinks create the interconnected "web" that makes the WWW a web.

Exam tip: Know the difference: the internet = physical network infrastructure; WWW = service (web pages) running on that infrastructure. Also know the 3-step process of search engines: crawl → index → rank.
⚠️ Common Mistakes
  • Saying "the internet and WWW are the same" — they are NOT. Email, gaming, and FTP also use the internet but are not the WWW
  • Forgetting that DNS is needed before any web request — the browser can't connect without knowing the IP address
  • Mixing up HTML (structure), CSS (style), and JavaScript (behaviour) — each has a distinct role
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✍️ Worksheet — 4.3b The Internet

8 questions · WWW, search engines, HTML

Q1Explain the difference between the internet and the World Wide Web.[3]
✅ Mark scheme
The internet is the global physical network of interconnected computers and devices [1]; the WWW is a service that runs on top of the internet — a collection of web pages accessed via HTTP/HTTPS [1]; email, gaming, and FTP also use the internet but are not part of the WWW [1].
Q2Describe the steps that occur when a user types a URL into a web browser and the page loads.[4]
✅ Mark scheme
Browser sends domain name to DNS server which returns IP address [1]; browser sends HTTP/HTTPS request to web server at that IP address [1]; web server returns HTML/CSS/JavaScript files [1]; browser renders/displays the web page [1].
Q3Describe how a search engine indexes web pages. Name the process and explain how it works.[4]
✅ Mark scheme
Crawling — automated programs (spiders/bots) follow hyperlinks across web pages to discover new content [2]; Indexing — discovered pages are analysed and stored in a large database [1]; Ranking — when a user searches, an algorithm ranks stored pages by relevance to the query [1].
Q4State the role of HTML, CSS, and JavaScript in creating a website.[3]
✅ Mark scheme
HTML defines the structure and content of the page using tags (headings, paragraphs, images) [1]; CSS controls the visual appearance — colours, fonts, layout [1]; JavaScript adds interactivity and dynamic behaviour — form validation, animations [1].
Q5What is DNS and why is it necessary for web browsing?[3]
✅ Mark scheme
DNS (Domain Name System) translates domain names into IP addresses [1]; it is necessary because computers locate each other using IP addresses, not domain names [1]; without DNS users would need to memorise numerical IP addresses for every website [1].
Q6What is a web browser? Give TWO functions of a web browser other than displaying web pages.[3]
✅ Mark scheme
A web browser is client-side software that requests, receives, and displays web pages [1]; any two: managing cookies/session data; storing browsing history; bookmarking websites; managing downloads; providing developer tools for inspecting web pages [1 each, max 2].
Q7Identify the components of this URL: https://www.cszone.co.uk/edexcel/lesson1[3]
✅ Mark scheme
https:// — the protocol used (HTTP Secure) [1]; www.cszone.co.uk — the domain name (converted to IP address by DNS) [1]; /edexcel/lesson1 — the path specifying the specific resource/page on the server [1].
Q8A student says "I'm connecting to the internet to browse the web." Explain why this statement is partially inaccurate and correct it.[3]
✅ Mark scheme
The student correctly says connecting to the internet but conflates this with the WWW [1]; the internet is the underlying network infrastructure (cables, routers, servers); the WWW is just one service that uses the internet [1]; corrected statement: "I'm connecting to the internet in order to use the World Wide Web (browse websites using a browser)" [1].
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Mini Test — The Internet

10 minutes · Exam-style

← 4.3a Protocols & LayersTopic 4 · Networks4.3c Wireless & Security →