Typically there is a notification associated with icons in the notification bar when you pull down the notification shade. Tapping that or long pressing it will give you more information about the app. Of course this also typically works when the device is yours. If the device belongs to someone else you've unfortunately run into another dead end as we will not talk about something you see on someone else's device. In which case you would need to ask that person.
As you've also not provided any information there is little we can do without more details.
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