params and query difference

Author: far1dghaderi

README.md

@@ -2654,7 +2654,12 @@ var server = app.listen(3000, function () {
 
 ## Q. ***What is the difference between req.params and req.query?***
 
-*ToDo*
+params are a part of a path in URL and they're also known as URL variables. for example, if you have the route /books/:id, then the “id” property will be available as req.params.id. req.params default value is an empty object {}.
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+A query string is a part of a URL that assigns values to specified parameters. A query string commonly includes fields added to a base URL by a Web browser or other client application, for example as part of an HTML form. A query is the last part of URL
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