The Persian Empire was conquered by the Greeks led by Alexander the Great. Starting in the year 334 BC, Alexander the Great conquered the Persian Empire from Egypt all the way to the borders of India.
In information technology, a Uniform Resource Identifier (URI) is a string of characters used to identify a resource. Such identification enables interaction with representations of the resource over a network, typically the World Wide Web, using specific protocols.
A URL is a Universal Resource Locator, a long fancy phrase for what is essentially a street address for a particular house - or in this case a web page or file. You may be aware that on most computers, files and programs are stored in folders (also known as directories).