A lease line connection is a point-to-point symmetric data link that's reserved solely for use by your company.
The link may be used to connect your office to the Internet or to connect it to another office.
Lease line connections are popular with businesses, as they are highly reliable, they offer predictable connection speeds, they're backed by Service Level Agreements and they have no data transfer limits.
They're available in a wide range of speeds. For example, you're not stuck with 'up to 20Mbps'. You can get 100Mb, 1000Mb and even 10,000Mb connection speeds.