Why use services in Angular?

Question

I am just starting out with Angular. Reading the example of a service in the Google documentation, I just wonder why you would choose to use a service rather keeping the var

Answer 1

When you want to keep a variable in memory (why not, a user session for instance) during navigation (differents partials with diffents controller are called). You have to keep in mind :

• Controllers are re-initialized each time you call them.

• Services are constructed only one time and are always available. So you can persist any information you need.