Widgets are a more advanced feature of WordPress that allow you even more control over the content on your site. In essence, widgets are small containers of content that can be placed in various areas of your site. Where you can place widgets depends entirely on the theme you are using. Many (most) themes include at least one “sidebar” into which you can place widgets. Some themes include additional “widgetized” areas. The best way to find out what areas are available to you is to go to Appearance > Widgets and take a look at the areas listed on the right. Each widgetized area will appear as a box on the right. In the example shown below, the theme contains three widgetized areas: Primary Sidebar, Content Sidebar, and Footer Widget Area.

On the right, you will see a number of widgets available to you. WordPress comes with some default widgets. Other widgets might become available when you have a particular theme activated. Finally, some plugins provide additional widgets to you.
Widgets can present all different kinds of information. The simplest widgets allow you to add text to your site. But you’ll also find widgets with many options that you can set to display dynamic content or to interact with other services. Below is a list of the default widgets available in WordPress.
When you’re ready to start using widgets, all you need to do is drag them from the right-hand side of the Widgets interface into the boxes on the left. WordPress will immediately save them, but you may need to set some options
Default Widgets
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Archives: Shows a monthly listing of your posts.
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Calendar: Shows a calendar view of your posts.
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Categories: Shows a list of all of the categories on your site.
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Custom Menu: Shows a custom menu that you’ve set up with WordPress’ Custom Menu interface.
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Links: Shows your links.
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Meta: Shows links to your RSS feed and your login.
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Pages: Shows a menu of all of your pages.
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Recent Comments: Shows the most recent comments on your posts.
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Recent Posts: Shows your most recent posts.
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RSS: Allows you to show content from an RSS feed.
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Search: Provides your users with a search box.
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Tag Cloud: Shows a “cloud” of the tags/categories on your site.
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Text: Shows whatever text you enter.
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WordPress: WordPress is a simple-to-use blogging application. The tool also comes with a huge array of plugins & themes to allow you to create virtually any kind of website imaginable. We have guides on using WordPress 
Scalar: Scalar is a content management system with the idea of creating non-linear books on the web. You can learn more about its functions and how to install it 
Mediawiki: It is the open-source wiki software that runs the online encyclopedia,