ACCESS
Once connected to the Internet, our computer seemingly becomes an extension of a giant computer that branches all over the world.
Providers
Internet service providers are connected to the Internet. The most widely used ISPs are national and wireless. Connection technologies include DSL, cable and wireless modems.
Browsers
Browsers access the web allowing us to surf or explore. Some related terms are:
ü URLs – locations or addressess to web resources, which is 2 parts are protocol and domain name; top-level domain identifies type of organizations.
Google Chrome
ü HTML – commands to display Web pages; hyperlinks are connections.
ü Javascript – a scripting language that adds basic interactivity and form checking to Web pages. AJAX allows rapid response time.
ü Applets – special programs linked to Web pages, typically written in Java.
ü Mobile Browsers – run on portable devices; display on very small screens and provide special navigational tools.
COMMUNICATION
E-mail or electronic mail is the transmission of electronic messages. The basic elements is header (including addressess, subject, and attachments), message and signature. Spam is unwanted and unsolicited e-mail that may include a computer virus. Spam blockers are programs that identify and eliminate spam.
Instant Messaging (IM) supports live communication with friends. Universal instant messengers support communication with other devices.
Social Networking connect individuals to one another. There are 3 types of social networking:
ü Reuniting sites connect people who have lost touch with one another.
ü Friend-of-a-friend sites bring together 2 people who share a common friend.
ü Common interest sites connect individuals who shares common interests or hobbies.
A Web log or blog is an online journal with chronological postings. A microblog publishes short sentences. For example: Twitter is the most popular microbloging sites. Aa wiki is a Web site that allows people to edit
or contribute to it by directly editing the pages
SEARCH TOOLS
Search services maintain huge databases relating to Web site content. Spiders are programs that update these databases.
Search engines locate information on the Web. 2 approaches are
ü keyword search
ü directory search
Metasearch Engines submit to several search engines simultaneously. Duplicate sites are eliminated, hits are ordered, and composite hits are preesented.
Specialized search engines focus on subject specific Web sites.
Content Evaluation consider the following criteria to evaluate the accuracy of information on the Web:
ü authority
ü accuracy
ü objectivity
ü currency
ELECTRONIC COMMERCE
Electronic Commerce or e-commerce is the buying and selling of goods over the internet. 3 basic types of e-commerce are business-to-consumer (B2C), business-to-business (B2B), and consumer-to-consumer (C2C).
B2C applications are online banking, online stock trading, and online shopping.
Web auctions are a growing C2C application. 2 basic types are auction house sites and person-to-person auction sites.
Security is the greatest challenge for online banking, online stock trading, and online shopping. 3 basic payment options are check, credit card, and digital cash. Buyers purchase digital cash from a third party and use it to purchase goods. Sellers accept digital cash and convert to traditional currency through the third party.
WEB UTILITIES
Web-based applications free users from owning and storing applications. The programs are accessed from a Web site. Web-based services typically provide free access. Application service providers (asp) typically are not free and provide access to more specialized programs.
Plug-ins are automatically loaded and operate as part of a browser. Many Web sites require specific plug-ins to fully experience their content. Some plug-ins are included in many of today’s browsers while others must be installed.
Filters are used by parents and organizations to block certain sites and to monitor use of the internet and the Web.
File transfer utilities copy files to (downloading) and from (uploading) your computer. 3 types of file transfer utilities are:
ü file transfer protocol (FTP) and secure file transfer protocol (SFTP) allow you to efficiently copy files across the internet.
ü Web-based file transfer services make use of a Web browser to upload and download files.
ü bitTorrent distributes file transfers across many different computers.
An internet security suite is a collection of utility programs designed to protect your privacy and security on the internet.
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