Can any one explain how it will work in apps which we really use ,how it will be used

Question

I want to ask is there any use in making apps

Answer 1

Question:
Is there any use in making apps?

Answer:
Yeah it's very very useful. If I want to learn programming, I use Sololearn application. If I want to do a phone call, I use the phone application. If I'm bored, I go to YouTube application and watch some cat videos. Even though some applications can be worked on the web without the application, it's not as fast as using an application. So applications are very useful.

Question:
Are variables useful in applications?

Answer:
Again, Yes it's useful and necessary. As an example, if you reduce your phone volume, the value of the volume is stored in a variable. If you reduce the brightness, the value of brightness variable is reduced. If you turn on "double tap to wake" feature, the corresponding variable's value becomes 1. Everything is stored using variables.

Hope you understand =)

Answer 2

Variables are used to store some data, you can change this data latter if your app need this, you can compare this with others to add logic in your app.
This is most important part od any code/app