Transcript Internet
1 Content What is the Internet? What is needed to connect to the Internet? The World Wide Web Criteria to evaluate websites Browsing and searching Glossary 2 What is the Internet? Definition The Internet is a worldwide computer network, consisting of computers and networks that are linked using telephone lines, undersea cables, satellite or microwave for the purpose of communication and sharing of resources. Every computer that connects to the Internet or in a network must have its own unique IP (Internet Protocol) address that currently consists of 4 sets of digits separated by dots. 3 What is needed to connect to the Internet? Computer / other Internet-enabled device Internet Service Provider Internet connection Wired connection – ADSL Wireless connection– Cellular technology 3G 4 What is needed to connect to the Internet? ADSL connection services have two different speed specifications: 512 Kbps / 128 Kbps 1Mbps / 256 Kbps Download speed Upload speed 5 What is needed to connect to the Internet? ADSL The costs = monthly ISP cost + line rental Access the Internet & phone calls at the same time. Check for availability of service ISPs offer different data packages 6 What is needed to connect to the Internet? Wireless connections Freedom of Internet connectivity without having to have an ADSL line installed Mobile access 3G modem or cellphone is used to connect your computer to the cellular network for Internet access. 7 The World Wide Web (WWW) The World Wide Web is a service that runs on the Internet and consists of a vast collection of interlinked, interactive documents stored on computers all over the world, accessed via the Internet. Website related web pages Web page – electronic document on Web Home page – 1st page of web site Hyperlink– built-in connection to another web page Web server – website must be hosted here 8 The World Wide Web (WWW) URL or web address Uniform Resource Locator (URL) Remember that an IP address is a numerical address that uniquely identifies a computer either on a network or on the Internet. The word protocol means a rule for communication. 9 Network Protocols IP HTTP HTTPS SMTP • Internet Protocol • HyperText Transfer Protocol • site is secure • Simple Mail Transfer Protocol FTP • File Transfer Protocol VoIP • Voice over Internet Protocol 10 Format of URLs :// http :// Type of . Domain name server www . webopedia.com https :// www www . Site name http :// www File or resource name / TERM/W/World_ Wide_Web.html . fnb.co.za Domain Name / channel/online. Type of .banking.html Geographical . studyopportunities.co.za identifier organization / Protocol location ftp ftp . uar.net . www .:// studyopportunities www . www . www . facebook cia gamesdomain wiki.answers en.wikipedia . . . . . co com gov co com org / / .pub/e-books/ za . uk 11 The World Wide Web (WWW) Types of websites Portal website • Selection of Internet services from one convenient location • Many are also Internet Service Providers who offer some of these services on their sites. The World Wide Web (WWW) Types of websites News website • Current events, news, sport, weather and exchange rates. • Many magazines and newspapers maintain websites that contain summaries of articles from the printed version and even articles not found in the printed version The World Wide Web (WWW) Types of websites Informational website • Most government institutions have an informational website. • Census and tax information as well as factual information that can be used for research purposes. The World Wide Web (WWW) Types of websites Business or marketing website • Information about selling a product or service. • Examples include: Woolworths, Pick and Pay, Kulula, SAA, Kalahari.net and Telkom The World Wide Web (WWW) Types of websites Personal website • Anyone can develop and maintain their own personal website to share interests, hobbies and life experiences with the world. • Most people these days are using a blog or a social networking site for their personal website.. The World Wide Web (WWW) Types of websites Wiki A wiki is a website that allows for the collaborative editing and creating of the content of web pages The World Wide Web (WWW) Types of websites Educational website Educational websites offer ways of formal and informal learning by means of tutorials and simulations. The World Wide Web (WWW) Types of websites Entertainment website An entertainment website offer all forms of entertainment such as online videos, music, sport, gaming and much more. Advocacy website This type of website describes an idea, opinion or cause and usually presents the views of a particular group or association. The World Wide Web (WWW) Types of websites Web application website . application is any application that is accessed over A web the Internet and is not stored on your local computer. The World Wide Web (WWW) Types of websites Content aggregator A website or application that gathers different web content (such as news, weather, movie reviews, stock prices, etc.) from many different online sources • and displays it on its own website OR • distributes it (RSS documents are called news feeds, channels, web feeds or just feeds.) RSS RSS stands for Real Simple Syndication Activity 1 23 Criteria to evaluate websites Authority • the author & credentials; ‘respected’ in the particular field of knowledge; institutional affiliation Accuracy . • information accurate; selected list of sources; Content / Design • easy to navigate & visually pleasing; content well organized; user-friendly Audience • satisfy needs Currency • Information up-to-date; When last was the site updated?; links kept up-todate Objectivity • unbiased Browsing and Searching What is a web browser? A web browser is a software application that allows one to view and explore web pages on the Web either via hyperlinks by typing the address in the address bar of the web browser. Browsing and Searching Most web browsers have the following features: home button address bar search bar back button print tabbed browsing forward button refresh, reload stop button favorites Browsing and Searching What is a search engine? A search engine is a program that is used to search for documents located on the Internet by using keywords or phrases entered by the user when looking for information. diamond Browsing and Searching Tips for successful searching Step 1: Decide exactly what you want to find. Step 2: Identify keywords. Step 3: Use synonyms. Step 4: Check your spelling. Step 5: Use advanced search options Browsing and Searching Remember Give credit where it is due Acknowledge a website source Meevis, Hans. Jewellery Gallery. April 2011. [http://www.meevis.com/jewelry-gallery-0601.htm] 21/05/2011. Author’s surname, name (if known). Title of website. Date on which the website was posted or updated. [URL] Date on which the website was visited by you. Browsing and Searching Searching for images To save a picture Save Picture As and choose the location you wish to save the picture to. OR copy the picture and paste it in an application Activity 2 31 Activity 3 Understand and apply 32 Glossary 3G Asymmetric Digital Subscriber Line (ADSL) Bandwidth Broadband Cap Data Terminating Device (‘Modem’) File Transfer Protocol (FTP) FTP server Home page Hyperlink HyperText Transfer Protocol (HTTP) Internet Internet Protocol (IP) Internet Protocol Address (IP address) Internet Service Provider (ISP) Search engine Uniform Resource Locator (URL) Web browser Web page Web server Website World Wide Web (WWW) World Wide Web Consortium