stands for J
otation. It is basically the standard format for transporting(sending and receiving) data across the internet.
format is used whenever you are storing/sending or receiving from a server a bit complex data that needs further processing. For example, If you are to retrieve a simple data say 1
from a server, you don't necessarily need to encode it in the JSON
format as this data can easily be converted from a string to a number and thereafter be use for whatever processing. But what if the data is Stack_ID67SuccessHTML5
where you may need the number (67) contained in the string for whatever processing or outputting.
That is where the JSON format comes in...
You can learn JSON in our official JSON tutorial here.