The term “URL” is often used as a different name for “web address” . An example of a URL is http://www.google.com.
Extensive Answer to "What is a URL?":
More accurately a URL (Uniform Resource Locator) is a Uniform (same throughout the world) way to Locate Resources (a document, file, database query, or command output) on the internet. URLs can be used by web browsers, email clients and other software to locate and identify a Resource.
The term “web address” is synonym for a URL that uses the HTTP or HTTPS protocol.