Old services vs Background services vs Foreground services

Question

In Kotlin android there were services, which work for older android versions, then there are background and foreground services. What are the differences? If I created an app with an old service will it work on new phones? I use my service for stopper working in the background with notification, maybe I should use something else?

Answer 1

This stackoverflow link should answer your question Timer in Background

You can also use this approach by creating a CountDownTimer extending a Service Class. You can reuse it at multiple instances. Android count down timer in background