Being in a restaurant, the first thing that gets presented to you is the menu. This action repeatedly happens whenever you go to a restaurant. In the same vein, so many events or activities get repeated in software engineering. Therefore, it is nice that we employ the DRY (Don't Repeat Yourself) concept all the time to make things easier.
This is a companion discussion topic for the original entry at https://strapi.io/blog/how-to-create-and-use-sms-and-email-services-in-strapi-1