Freeing up iPhone storage

So I would like to free up storage space on my iPhone. The iPhone or Apple is telling me that my storage is becoming too full. When I tap on the Ring APP, I can reach a message that has two options. One says "Offload App", the other says "Delete App". The description under Offload App says the following; "This will free up storage used by the app, but keep it's documents and data. Reinstalling the app will place back your data if the app is still available in the APP STORE". It is a bit confusing. So does Offload App delete the App ? This is what the message says to my mind.