Often used interchangeably with the “address” of a web page, such as http://hackshackers.com. All URLs are URIs, but not vice versa. While humans are familiar with URLs as a way to see web pages, computer programs often use URLs to pass each other machine-readable content, such as RSS feeds or Twitter information. In addition, words that appear in URLs often help boost search rankings, which is why many content sites are now shifting to URLs with headlines as opposed to data strings.