Query Parameters
Query parameters are optional key-value pairs that appear to the right of the ? in a URL. For example, the following URL has two query params, sort and page, with respective values ASC and 2:
http://example.com/articles?sort=ASC&page=2
Query params allow for additional application state to be serialized into the URL that can't otherwise fit into the path of the URL (i.e. everything to the left of the ?). Common use cases for query params include representing the current