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The foundation of learning programming for Android is basic categories – the “bricks” from which we create a full-fledged app. We'll understand what it is and how to use it today. In the Android OS, many app mechanisms work based on the Intent. The Intent is a variable that describes a specific action. After specifying which Activity should be triggered, the code must pass this variable to the startActivity method. It automatically finds the desired Activity and shows it. The difference between explicit invocations and implicit invocations is explained.