They are important because without them we wouldnt be able to look up information on different sites.
Not usually.
WikiAnswers made a corporate decision to disallow web addresses. These go in Related links.
The data type that stores web addresses (URLs) in Access is typically a "Hyperlink" data type. This data type allows users to store and access web addresses as clickable links within the database.
Web addresses can be obtained by purchasing a web domain. Domain site will provide you with everything you need for your website for a cost to fit your budget to get you the website you need.
Austria is the country with .at web addresses. Australia, however, has .au addresses instead.
.us - Is an abbreviation for the United States in web addresses.
Hyperlink
Web addresses are case sensitive for Linux/UNIX based operating systems.
There are some sites online where you can check if a web address is already in use. If you are making a site with a free online host you can take a look which web addresses are still aviable.
Crawler
You are not allow to give out web addresses.
web addresses are not permitted here.