WordPress extension capable components are: 
              Themes, determine your site’s appearance and how content is displayed.
              Plugins, can add functions, template tags or widgets.
              Widgets, are drag-and-drop components that can be added to your site’s sidebars.

Installing WordPress using the Web Interface:1> Download a latest version WordPress from wordpress.org
                2> Check the basic requirement of database and PHP version
                3> Upload the wordpress folder in host
                4> Open WordPress folder using web browser
                5> Create a database
                6> Click on Let’s go button
                7> Set database information Database Name(that previously created), User Name, Password, Database Host and Table Prefix(optional) 
                8> Click Submit button
                9> Click Run the install button
                10> Set Needed Information Site Title,Username(Usernames cannot be changed),Password,E-mail(This information is editable) and Check Privacy check box 
                11> Click on Install WordPress button
                   You can see Success! Page, So installation is successfully done.