Update README.md

Author: sulavtimsina

README.md

@@ -792,7 +792,8 @@ If we're using Android Studio to build your app, the manifest file is created fo
 #### Fragments
 
 * What is `Fragment`?
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+	- A Fragment represents a reusable portion of your app's UI. A fragment defines and manages its own layout, has its own lifecycle, and can handle its own input events. Fragments cannot live on their own--they must be hosted by an activity or another fragment. The fragment’s view hierarchy becomes part of, or attaches to, the host’s view hierarchy.
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 * What is the difference between a `Fragment` and an `Activity`? Explain the relationship between the two.
 
 * Why is it recommended to use only the default constructor to create a `Fragment`? [StackOverflow](https://stackoverflow.com/a/16042750/2809326)