What is a Search Engine? A tool or web interface that enables a user to locate information on the www, Search engine use keywords entered by users to find websites which contain the information sought. A special kind of web page where the user types in a query and in return receive a list of links to sites that include all or part of what was typed. A search engine is searching database that claims to index the full Web Called search engine. These search engines have an enormous pool of information that contains information relating to the subject that you are looking for. To use a search engine, you type one or more words that describe the subject you are looking for. Generally, it is a good idea to type several words (four or five) rather than one or two. The most commonly use search engines are google.com, bing.com and yahoo.com etc.
GOOGLE | SEARCH ENGINE
Google is a Search Engine. Google is used to search/surf the Internet/WWW found at www.google.com. Google is fast and easy to use search engine, which produces good results. Latest features include a search for pdf documents, videos, images and books etc. Google has a new tabbed interface with a set of tabs to provide easier access to search results from all Google’s properties, including Web search, image search, Google Groups, and the Google Directory. You can also search by file type e.g pdf or asp or htm.
Internet users use to reference anything by name on the Internet. A unique name that identifies an Internet site. Domain Names always have two or more parts, separated by dots. The part on the left is the most specific, and the part on the right is the most general. A given machine may have more than one Domain Name but a given Domain Name points to only one machine. For example, the domain names: matisse.net mail.matisse.net workshop.matisse.net can all refer to the same machine, but each domain name can refer to no more than one machine. Usually, all of the machines on a given Network will have the same thing as the right-hand portion of their Domain Names (matisse.net in the examples above). It is also possible for a Domain Name to be present but not be connected to an authentic machine. This is often done so that a group or business can have an Internet E-mail address without having to establish a real Internet site. In these cases, some real Internet machine must handle the mail on behalf of the listed Domain Name. Domain is the name of a server. Different domain is used for different purpose;
.com is used for commercial purposes. e.g. yahoo.com, hotmail.com etc.
.edu is used for education purpose e.g. commerce.edu.pks bisep.edu.pk, nestle.org.edu.pk etc.
.net is used for network purpose e.g brain.net.pk,
.mil is used for military purposes e.g us.mil.us.
.isp is used for internet service providers. e.g. pknet.isp etc
.gov is used for official purpose e.g hec.gov.pk. nwfp.gov.pk etc
DOMAIN NAME EXTENSION
1. The Big three are .com, .net and .org
Although there has recently been some discussion about possible moves to restrict the .org top domain to non-profits, as was originally intended, the current situation is that all three of these domain name extensions are accessible to anyone, without restrictions, and are widely recognized around the world.
2. Country-level top domains (identified as such)
Most countries now have a matching top-level domain name, under which domains are sold (either directly, or with an intervening subdomain such as .co. or arg.). Prime examples include .fr (France), .jp (Japan – where .co.jp is also in widespread use) and .co.uk. These types of a top-level domain name are generally under government control, adding a level of durability and permanence that a 3rd party might find hard to match (see next sub-section).
3. Country-level top domains (masquerading as something else)
Control over some country-level top domains has been ceded, either permanently or under contract, to various commercial organizations around the world. Many of these organizations don’t exactly go out of their way to advertise the local origin of their domain names.
4. New.net domain names
Basically, the fundamental difference between New.net domains and regular domains is that New.net domains are NOT recognized at the Root DNS level. The mapping of domain names to addresses (which allows you to type in “Microsoft.com” into your browser yet have your computer – which speaks only numbers – communicate with Microsoft’s servers) is done by a number of large servers scattered around the world.
5. “Alternative” top domains
There are a number of companies in the “alternative” top domain business. Essentially, their systems work something like New.net is that additional changes or software are required to make them: domain names resolve, except that generally unlike New.net they have not forged many (or any!) partnerships with ISPs and hosting firms, so that the number of people who can access these “alternative” top domains worldwide numbers in the hundreds or at most in the thousands.