• A service is a component of an application that can do long-running tasks in the background. It doesn't have a graphical user interface. A service that has been started may continue to operate for some time after the user has switched to another application.
• A component can also bind to a service in order to communicate with it and even do interprocess communication (IPC). A service, for example, can run in the background and manage network transactions, play music, do file I/O, and connect with a content provider.
• A foreground service executes a task that is visible to the user.
• A background service is a programme that runs in the background and is not visible to the user.

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