What is the SQL Server JSON Export Process?

Hi Guys!
I am not familiar in using JSON or Java Object Notation. I am not even sure the functionalities of json and how to use it on SQL database like MSSQL Server. Can anyone please tell me how the SQL server json export happens? Can anyone please provide the steps in exporting to json. Also, if you can show some of your sample codes, it will be very helpful. Please give some time to share your knowledge.
Thanks.
Ammelia Jesse
