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Search Engines

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Introduction Search Engine  refers to a huge database of internet resources such as web pages, newsgroups, programs, images etc. It helps to locate information on World Wide Web. User can search for any information by passing query in form of keywords or phrase. It then searches for relevant information in its database and return to the user. Search Engine Components Generally there are three basic components of a search engine as listed below: Web Crawler Database Search Interfaces Web crawler It is also known as  spider  or  bots.  It is a software component that traverses the web to gather information. Database All the information on the web is stored in database. It consists of huge web resources. Search Interfaces This component is an interface between user and the database. It helps the user to search through the database. Search Engine Working Web crawler, database and the search interface are the major component of a...

Acid Rain

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What is Acid Rain? Acid rain, or acid deposition, is a broad term that includes any form of precipitation with acidic components, such as sulfuric or nitric acid that fall to the ground from the atmosphere in wet or dry forms.  This can include rain, snow, fog, hail or even dust that is acidic.   What Causes Acid Rain? Acid rain results when sulfur dioxide (SO 2 ) and nitrogen oxides (NO X ) are emitted into the atmosphere and transported by wind and air currents.  The SO 2  and NO X  react with water, oxygen and other chemicals to form sulfuric and nitric acids.  These then mix with water and other materials before falling to the ground. While a small portion of the SO 2  and NO X  that cause acid rain is from natural sources such as volcanoes, most of it comes from the burning of fossil fuels.  The major sources of SO 2  and NO X  in the atmosphere are: Burning of fossil fuels to generate electricity.  Two thir...

Webmail

Web mail  (or  web-based email )   Is any email client implemented as a web application running on a web server. Examples of web mail software are Round cube and Squirrel Mail. Examples of web mail providers are AOL Mail, Gmail, Outlook.com/Hotmail.com and Yahoo! Mail. []  Many web mail providers also offer email access by a desktop email client using standard email protocols, while many internet service providers provide a web-mail client as part of the email service included in their internet service package. As with any web application, web mail's main advantage over the use of a desktop email client is the ability to send and receive email anywhere from a web browser. Its main disadvantage is the need to be connected to the Internet while using it. Other software tools also exist to integrate parts of web mail functionality into an OS (e.g. c...

Website

A website is a collection of web pages (documents that are accessed through the Internet), such as the one you're looking at now. A web page is what you see on the screen when you type in a web address, click on a link, or put a query in a search engine. A web page can contain any type of information, and can include text, color, graphics, animation and sound. When someone gives you their web address, it generally takes you to their website's home page, which should introduce you to what that site offers in terms of information or other services. From the home page, you can click on links to reach other sections of the site. A website can consist of one page, or of tens of thousands of pages, depending on what the site owner is trying to accomplish. Why Do People Visit Websites? Generally, people look at websites for two primary reasons: 1. To find information they need. This could be anything from a student looking for pictures of frogs for a school project, to finding...

Web Design

Web design is the process of creating websites. It encompasses several different aspects, including webpage layout, content production, and graphic design. While the terms web design and web development are often used interchangeably, web design is technically a subset of the broader category of web development. Websites are created using a markup language called HTML. Web designers build webpages using HTML tags that define the content and metadata of each page. The layout and appearance of the elements within a webpage are typically defined using CSS, or cascading style sheets. Therefore, most websites include a combination of HTML and CSS that defines how each page will appear in a browser. Some web designers prefer to hand code pages (typing HTML and CSS from scratch), while others use a "WYSIWYG" editor like Adobe Dreamweaver. This type of editor provides a visual interface for designing the webpage layout ...