Talk about your favourite app

Talk about your favourite app
1. What is it?
2. What type of app is it? (entertaining, working, studying, advertising, searching...)
3. Where do you find it?
4. What company does it belong to?
5. What year did it come out?
6. What can it do?
7. How does it help you?
8. How often do you use it?
9. Why do you like it?