What is the KLM - Royal Dutch Airlines application, how does it work?

According to the introduction of KLM Koninklijke Luchtvaart Maatschappij N.V., KLM - Royal Dutch Airlines is a Travel & Local app on the Android platform. There is currently a 11.1.0 version released on Feb 24, 2020, you can see the details below.

The new and vastly improved KLM app is ready to deliver what you need, when you need it. With features like one-tap check-in, effortless seat changes, and handy destination information, you’re always one step ahead on your journey.
  
CHECK FLYING BLUE MILES: Check and manage your Flying Blue status, Miles and benefits instantly.

CHECK IN FOR FLIGHTS: Breeze through check-in with a single tap and always have your boarding pass at hand.

CHANGE SEATS: Whether it’s window or aisle, you effortlessly change your seat. Feel like stretching your legs? Our new app suggests the best deals for extra comfort.
 
ADD BAGGAGE: The new KLM app lets you add baggage faster than you can pack.
 
FLIGHT UPDATES: Take your eyes off the departure screens, sit back and relax. We’ll keep you up to speed with the latest updates on your journey.

TRAVEL INSPIRATION: Discover the world through inspiring articles on your Android tablet. [[[[[[[[[[[select ]]]]]]]]]]]your favourite themes to find your next journey of inspiration.

BOOK A TRIP: You pick the destination; we take care of the rest. Choose the best flight, date and fare type, and book straight from the app.
  
ONE-TAP PAYMENT: Save your credit card details so you can book flights, add baggage or choose more comfort with your wallet out of sight.