what is the benefit using route:chace in laravel 5

I'm new to Laravel, and also new to PHP. and I have the following command that laravel 5 can chace the route :

$ php artisan route:cache
  Route cache cleared!
  Routes cached successfully!

My Questions are :

1. What is the Benefit using route:chace in Laravel 5?
2. do I have to use it in production mode?
3. And what is the different between using route:chace and not using it? is it faster?

Thank you.

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