Custom REST API

In the previous part-1 of this series we talked about the Rest API and how can we define the Rest API Plugin type in your system. In the previous example we have defined the REST Plugin in your custom module, add some get()/Post() methods for reading and writing operations. 

Now in this series of Rest API or Rest API part-2, we will discuss more about REST API and we will show how to define REST API using a custom controller class.
Now the question arises here why do we need this custom Rest API controller class over the REST API plugins?

Rest API: (Representational State Transfer)

In this series of the blog we will discuss custom rest APIs and how can we define it in Drupal 8. I have divided this series into 2 parts. In our first part we will discuss core rest APIs and "How can we extend Rest module to define our custom API in Drupal 8" and In our 2nd part we will discuss, "How can we define Rest Api using controller".