Are you looking for Task Manager on your Android device? We'll tell you where to find it..
With the task manager you can view and close active applications on your smartphone. If you start and exit an application without closing it properly, it remains in memory. If you have a large number of apps open at the same time, this can lead to slower performance of your smartphone. You should therefore close all applications via the task manager at least once a day. However, you should not always do this after using an app, as the app has to be restarted every time, which in turn consumes a lot of power.