what is api postman code example

Example 1: what is curl in api

curl is a command line client to send request and
get respond from command line, so it's basically 
it's just way to send a request and response. Where you
send it we call it client. But with postman we can do more
than just sending request end respond.
This tool is preferred for automation, 
since it is designed to work without user interaction.
curl can transfer multiple file at once.

Example 2: what is in request api

REQUEST :(request url,http methods,header,query param, param,body,cookie)

1-)Request Url where we have Endpoint (domain:Port/Endpoints)

2-)HTTP METHODS(Get, Post, Put, Patch, Delete, Header)

Get: For to retrieve resources from the server
Post: to send or add resource to the server
Put: For update the resources in the server
Patch: For partial update the resource
Delete: For deleting the resource in the server
Head: To get header from the response not the body

3-)HEADER is metadata is about the request,
basically providing more information along
with the request.

-Content Type header : to specify what kind of
 data we are sending to the server
-Accept Header : to specify what kind of data 
 format you want to get in the response like (json or xml)
-Authorization header : used to provide the
 Bearer token in many api's.

4-)Query Parameter: A key value pair usually
 for filtering result

5-)Parameter: for identifying single resource
 among the list of resources.
6-)Payload(BODY): for POST,PUT,PATCH request
(json,xml,plainText,URL encoded for data)
7-)Cookie