I find people struggle a little with differentiating leased lines from other forms of connectivity, purely due to the use of the term leased. All of these connections require you to lease some form of service from your provider, and that's what confuses people. What I would ask you to do to combat this is to prefix leased lines with the word dedicated.
Unlike other forms of connection discussed here, a leased line is a dedicated link between you and another location. It's dedicated in that it is only you using it, and, unlike the others we will discuss, it is not shared with other subscribers. You may have noticed that I refer to another location rather than specifically mentioning the connection is to your service provider. This is deliberate, because although most leased lines will connect you to your service provider, you may also have a dedicated connection...