An internet connection with a larger bandwidth can move a set amount of data (say, a video file) much faster than an internet connection with a lower bandwidth. Bandwidth is typically expressed in bits per second, like 5 Mbps or 5 Mb/s, to explain a data transfer rate of 5 million bits (megabits) every second.
Shared Internet is probably what your business and home are equipped with right now; a single Internet service shared among users, which can then be accessed on various devices and internal networks. On a shared Internet connection, all bandwidth (5 Mbps, 10 Mbps, etc.) is split among all users and devices.
Dedicated bandwidth is bandwidth that’s reserved solely for the use of one subscriber, usually a business. The ring-fencing of the bandwidth ensures that the business always gets the same high data throughput, regardless of what other subscribers may do with their connections.