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Since Android devices are usually battery-powered, Android is designed to manage memory (RAM) to keep power consumption at a minimum, in contrast to desktop operating systems which generally assume they are connected to unlimited mains electricity.

Since Android devices are usually battery-powered, Android is designed to
manage memory (RAM) to keep power consumption at a minimum, in contrast to
desktop operating systems which generally assume they are connected to
unlimited mains electricity. When an Android app is no longer in use, the system
will automatically suspend it in memory - while the app is still technically "open,"
suspended apps consume no resources (e.g. battery power or processing power)
and sit idly in the background until needed again. This has the dual benefit of
increasing the general responsiveness of Android devices, since apps don't need
to be closed and reopened from scratch each time, but also ensuring background
apps don't waste power needlessly.
Android manages the apps stored in memory automatically: when memory is low,
the system will begin killing apps and processes that have been inactive for a
while, in reverse order since they were last used (i.e. oldest first). This process
is designed to be invisible to the user, such that users do not need to manage
memory or the killing of apps themselves. However, confusion over Android
memory management has resulted in third-party task killers becoming popular on
the Google Play store; these third-party task killers are generally regarded as
doing more harm than good.