Some of Google's URLs include www.google.com, adwords.googleblog.com, and http://www.google.com/intl/en/privacy. Just as buildings and houses have a street address, webpages also have unique addresses to help people locate them. On the Internet, these addresses are called URLs (Uniform Resource Locators).

Actually, “www.google.com” isn't a URL, it's a FQDN. A URL looks like this: “https://www.google.com”. So, a “URL” isn't actually a “web address.” It's a construct that identifies a protocol (HTTP) and an address (in this case the FQDN “www.google.com”).