Learning Objectives
- Explain the main purpose of a web browser.
- Describe how a browser renders HTML and displays web pages.
- Describe bookmarks, history, tabs, cookies, navigation tools and the address bar.
- Select and explain browser functions in unfamiliar scenarios.
Key Terms
- Web browser
- Application software used to request, render and display web pages.
- Render
- Interpret page instructions and produce the visual and interactive page shown to the user.
- HTML
- Hypertext Markup Language, used to describe the structure and content of a web page.
- Bookmark or favourite
- A saved reference to a web page, normally storing its URL.
- History
- A record of web pages previously visited by the user.
- Tab
- A browser section that allows a separate page to remain open within the same window.
- Cookie
- Small data stored by a browser for a website.
- Navigation tools
- Controls such as back, forward, refresh and home used to move between or reload pages.
Main Purpose Of A Browser
A web browser is application software whose main purpose is to render HTML and display web pages. It requests resources from web servers, interprets the HTML returned and presents the page to the user.
Rendering is more than showing the HTML source as plain text. HTML contains markup that identifies headings, paragraphs, hyperlinks and other page structures. The browser interprets this markup and constructs the page display.
A browser also enables interaction. A user can select hyperlinks, enter data into forms, move between pages and open several pages at the same time.
Address Bar And Navigation Tools
The address bar allows the user to enter a URL and commonly displays the address of the current page. It is also a security checkpoint because the user can inspect the protocol and domain name.
Navigation tools make browsing efficient. Back returns to an earlier page in the current browsing sequence. Forward moves to a page after the user has moved back. Refresh requests the current page again, which can retrieve updated content. A home control can open a chosen starting page.
The browser must not be confused with a search engine. The browser is installed application software. A search engine is an online service that can be accessed through a browser.
Bookmarks History And Tabs
A bookmark, also called a favourite, stores the address of a page so that it can be opened again without retyping or searching for the URL. Bookmarks are deliberately saved by the user.
Browser history records pages that have been visited. It can help a user return to a page even when it was not bookmarked. History can also reveal browsing activity, so it has privacy implications on a shared device.
Multiple tabs allow several pages to remain open in one browser window. A learner can keep a question page, a reference page and a results page available and move between them without repeatedly closing and reopening pages.
Storing Cookies
Browsers can store cookies supplied by websites and return relevant cookie data during later communication with those sites. Cookies can support login sessions, preferences and shopping carts.
Cookie storage is a browser function, but the website determines the purpose and content of the cookie. Session and persistent cookies are studied separately because they differ in how long they remain available.
Browser Functions And Uses
| Function | What It Does | Example Use |
|---|---|---|
| Render HTML | Interprets HTML and constructs the displayed page | Shows headings, text and hyperlinks in the intended structure |
| Bookmarks | Stores selected page addresses | Saves a revision page for later use |
| History | Records previously visited pages | Finds a page opened earlier |
| Multiple tabs | Keeps several pages open in one window | Compares information from two websites |
| Cookies | Stores small items of website-related data | Maintains a session or preference |
| Navigation tools | Moves between or reloads pages | Uses back or refresh |
| Address bar | Accepts and displays a URL | Enters a page address or checks the domain |
Worked Examples
Choosing A Browser Function
Question: A student regularly uses the same syllabus page and wants to open it quickly each week. Which browser function is most suitable?
- Identify that the page should be deliberately saved for future use.
- Compare bookmark and history: history is automatic and may become difficult to search.
- Choose the function designed to save a selected page.
Answer: A bookmark or favourite is most suitable because it stores the page URL for convenient future access.
Browser Or Search Engine
Question: A candidate writes that a search engine renders HTML. Correct the statement.
- Identify the application responsible for rendering.
- Distinguish it from the online search service.
Answer: The web browser renders HTML and displays the page. A search engine is a web-based service used to find resources.
Examination Guidance
- Use the syllabus phrase render HTML and display web pages when explaining the main purpose.
- For a function question, explain what the function does and why it suits the scenario.
- Do not confuse bookmarks with history: bookmarks are deliberately saved, while history records visits.
- Do not call a search engine a browser.
Common Mistakes
- Listing browser names instead of explaining browser functions.
- Saying a bookmark stores the complete website on the device.
- Claiming that browser history contains only bookmarked pages.
- Describing tabs as separate computers or separate internet connections.
Knowledge Check
1. What is the main purpose of a web browser?
2. How is a bookmark different from browser history?
3. What is the purpose of multiple tabs?
4. Why is the address bar useful for security?
5. State two browser navigation tools.
