What do we Understand by the word "THEME" in asp.net ?

Answer: 
Theme is a group of property settings that allows to define the look and feel of the controls to be consistent through out the Web Application . 

One of the advantage with themes is unlike CSS we can even Design server side controls like for example Treeview the style of rendering elements into the browser can be changed as per our wish. 

Here we can even change entire Web Application look and feel by just changing the theme properties. 

Hence these Themes could be very much useful for UI development of a web application

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