• Uniform Resource Locator: a string used to identify a resource
• A valid URL is one thst is a valid web address
• Defines an Internet address, protocol to be used and where the document is
• Consists of:
  • protocol (http, ftp, news...)
  • host (machine.institution.type_of_institution.country)
  • port (usually unnecessary)
  • path directory where file resides
  • filename name of file
  • fragment position in file (optional)

protocol://host:port/path/filename#fragmentposition

http://www.w3c.org:8080/history/html/MarkUp.htm#chap2