INTRODUCTION TO WEB
1. What is the Internet?
The internet is the largest computer network in the world, connecting millions
of computers. A network is a group of two or more computer systems linked
There are two main types of computer networks:
Local Area Network (LAN): A LAN is two or more connected computers sharing
certain resources in a relatively small geographic location, often in the same building.
Examples include home networks and office networks.
Wireless local area network (WLAN) : A wireless local area network (WLAN) is
a wireless distribution method for two or more devices that use high-frequency radio
waves and often include an access point to the Internet. A WLAN allows users to
move around the coverage area, often a home or small office, while maintaining a
A WLAN is sometimes call a local area wireless network (LAWN).
2. The World Wide Web (WWW)
When most people think of the internet, the first thing they think about is
the World Wide W eb. Nowadays, the terms “internet” and “World Wide Web”
are often used interchangeably— but they’re actually not the same thing
The internet is the physical network of computers all over the world.
The World Wide Web is a virtual network of web sites connected by
hyperlinks (or “links”). Web sites are stored on servers on the internet, so
the World Wide Web is a part of the internet.
3. WEB BROWSER.
A web browser (commonly referred to as a browser) is a software
application for accessing information on the World Wide Web. Each
individual web page, image, and video is identified by a distinct URL, enabling
browsers to retrieve and display them on the user’s device.
History of the web browser
The first web browser, called World Wide Web, was invented in 1990 by
Sir Tim Berners-Lee. He then recruited Nicola Pellow to write the Line Mode
Browser, which displayed web pages on dumb terminals; it was released in 1991.
4. WEB SEARCH ENGINES .
A web search engine is a software system that is designed to search for
information on the World Wide Web. The search results are generally
presented in a line of results often referred to as search engine results
pages (SERPs). The information may be a mix of web pages, images, and other
types of files.
5. WEB SITES .
A website is a collection of related web pages, including multimedia content,
typically identified with a common domain name, and published on at least one web
server. Notable examples are wikipedia.org, google.com, and amazon.com. Today
roughly 380 new websites are created every minute across the World.
A website may be accessible via a public Internet Protocol (IP) network, such as
the Internet, or a private local area network (LAN), by referencing a uniform resource
locator (URL) that identifies the site.
Websites can have many functions and can be used in various fashions; a website can
be a personal website, a corporate website for a company, a government website, an
organization website, etc. Websites are typically dedicated to a particular topic or
purpose, ranging from entertainment and social networking to providing news and
education. All publicly accessible websites collectively constitute the World Wide
Web, while private websites, such as a company’s website for its employees, are
typically a part of an intranet.
6. Web server .
The primary function of a web server is to store, process and
deliver web pages to clients. The communication between client and server takes
place using the Hypertext Transfer Protocol (HTTP). Pages delivered are most
frequently HTML documents, which may include images, style sheets and scripts in
addition to the text content.
7. Home Page .
A home page or a start page is the initial or main web page of a website or
a browser. The initial page of a website is sometimes called main page as well.
A home page is generally the main page a visitor navigating to a website from
a web search engine will see, and it may also serve as a landing page to attract
visitors. The home page is used to faciliate navigation to other pages on the
site by providing links to prioritized and recent articles and pages, and possibly a