URI stands for Uniform Resource Identifier.
Uniform Resource Identifier Explanation and Uses
A Uniform Resource Identifier is a string of characters that helps identify a particular resource on the internet.
All URIs follow a predefined set of syntax rules, to maintain uniformity, but also maintain extensibility through a separately defined hierarchical naming scheme (e.g. “https://”)
URI’s syntax consists of a hierarchical sequence of five main components.
URI = scheme:[//authority]path[?query][#fragment]
https: is the scheme
//mrvirk.com is the authority
?country=UK is the query, which is used to provide additional information on the page.
#pageTop is the fragment/section on the page you are interested in for example top heading.
Here’s an another example: https://mrvirk.com/download-and-install-a-wordpress-plugin.html?greeting=hello#Step_3_Activate_Plugin