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Describe about the activity component of Android?

Answer:

Activity provides an interface for users to interact with the application and take an action; for instance: Login to a website. The different screens/windows of an application are the different activities. An application generally has multiple activities.
Activities are like the pages in a website. For instance, in a Facebook app, the login screen is one activity, and the news feeds from your friends after signing in would be another one.

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