Yes, apps is useful to me very much.

I have many apps as much non-countable number of it.
But I continually delete it and replace it.
Because I am confused by modern-century\'s Technology.
And I always be with apps.
They are my part of life.

I have many apps like (SNS, Google map, Kakao talk)

But I continuously delete some of them and replace it with other apps because I am quite confused by modern century\'s Technology. these apps are already part of my life.

Which is the most useful app to you?

For example: Google map, this app is very useful for me especially when I need to find directions.