Search engines are the largest of the findings aids and often search the full text of many web pages. The resources found are often numerous, numbering in the millions, though not always well selected for quality or subject relevance. Search engines use spiders or robots, to continually comb vast domains of internet documents for information. Resources found are placed in the search engine’s databases which are made available for searching by the user. Users can connect to a search engine site and enter keywords to query the index. The best matches, whether Web pages or other internet resources, are hen returned as hits. Search engines vary according to the size of the index, the frequency of updating the index, the search options, the speed of returning a result set, the result of presentation, the relevancy of the items included in a result set, and the overall ease of use.
World Wide Web
The World Wide Web is the universe of network-accessible information, the embodiment of human knowledge. The World Wide Web began as a networked information project at CERN, where Tim Berners-Lee, now Director of the World Wide Web Consortium (W3C) , developed a vision of the project. The Web has a body of software, and a set of protocols and conventions. Through the use hypertext and multimedia techniques, the web is easy for anyone to roam, browse, and contribute to.
Electronic Mail (e-mail) is one of the most popular services of the internet. Electronic mail is the transmission of message over communication networks. The messages can be notes entered from the keyboard or electronic files stored on disk. The first e-mail was sent by Ray Tomlinson in 1971. A computer, network connection and an e-mail address are needed for using e-mail.
Advantages of an E-mail
The advantages of an electronic mail are as follows:
- E-mail enables speedy communication.
- E-mail provides the receiver an option to respond immediately.
- E-mail is a low cost way to transmit messages.
- E-mail message are always easy to locate.
Disadvantages of an E-mail
The disadvantages of an electronic mail are as follows:
- Lack of computer knowledge among people, so not sure all receiving parties use email system.
- Unwanted SPAM emails.
- Illegal contents including VIRUS damages end user systems, data and reputation.
Computer Networking Concepts
A computer networking is a group of computer systems and other computing hardware devices that are linked together through communication channels to facilitate communication and resource-sharing among a wide range of users. For example, a business might use a computer network connected via cables for wireless transmission in order to gain access to a common server or to share programs, files and other information. Computer network offers the following advantages. They are as follows:
a. Computer network facilitates communication via email, video conferencing, instant messaging, etc.
b. Computer network enables multiple users to share a single hardware device like a printer or scanner.
c. Computer network enables file sharing across the network.
d. Computer network make information easier to access and maintain among network users.
e. Computer network allows for the sharing of software or operating programs on remote systems.
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