What are Android services?

Android service is a component that is used to perform operations on the background such as playing music, handle network transactions, interacting content providers etc. It doesn’t has any UI (user interface). The service runs in the background indefinitely even if application is destroyed.

What are the two main types of services in Android?

Android has two kinds of services: bound and unbound services. An unbound service will run in the operating system`s background for an unlimited time, even when the activity that just started this service will end in the future. A bound service will work till the activity which started the service ends.