An ADSL circuit must be configured to connect two specific locations, similar to a leased line. Often permitted by large, host computers who are willing to share openly some of the files on their system to outside users who otherwise would not be able to log in. The current rule is that an applet can only make an Internet connection to the computer from which the applet was sent. It's an archive of filenames maintained at Internet FTP sites. The precursor to the Internet.
Video quality can be very good at smaller resolutions, but files tend to be rather large.
A high-speed line or series of connections that forms a major pathway within a network. The term is relative as a backbone in a small network will likely be much smaller than many non-backbone lines in a large network. The transmission capacity of the lines that carry the Internet's electronic traffic. Or how much data you can stuff through a connection. Historically, it's imposed severe limitations on the ability of the Internet to deliver all that we are demanding it deliver.