What are differences between JobIntentService and IntentService?

I do not understand what difference between those two APIs. I mean when to use the first one. Why is there JobIntentService ? Thanks in advance

I would recommend to read this article explaining about the difference between intent service and job intent service. When we look for the first time at these terms Service, IntentService, JobIntentService they would look almost similar - in one way or other they would perform some operations in background (which user does not notice). But there is few difference in the way they operate,

• Service - This runs on the same main thread which invokes this service and performs some background operation. For any long running operation happening on the main thread it is recommended to create a new thread and do the job (eg; Handler) by not impacting the main thread's performance.

  Drawback : Runs on main thread

• IntentService - Intent service also helps in doing some long running (indefinite) background task. The only difference is that it creates a new thread to perform this task and does not run on the main thread. Does the given job on it's onHandleIntent.

  Drawback: The job given to the IntentService would get lost when the application is killed

• JobIntentService - Job intent service is very similar to IntentService but with few benefits like the application can kill this job at any time and it can start the job from the beginning once the application gets recreated/up.

But from Oreo, if the app is running in background it's not allowed to start the service in background. Android asks us to start the service explicitly by context.startForegroundService instead of context.startService and when the service is started within 5 seconds it must be tied to the notification to have a UI element associated with it.

Reference : https://developer.android.com/about/versions/oreo/background.html