Definition of URL:  the initials URL stand for Universal Resource Locator.  This is frequently described as a website address.  It’s what you type in to your browser bar in order to get to a specific site.  For example, http://www.actnowdomains.com is the URL of the home page of this website.

Every website page is it’s own unique URL.  For example, the URL of this web page is http://www.actnowdomains.com/url-what-it-is.htm.   Having a separate address for each of your web pages allows you to link your pages together as well as lets you differentiate each of your pages for your visitors.