A dedicated hosting account will give a business an entire server just for them. Obviously, this is often costly but may be necessary for websites that have many users and/or large amounts of data such as images and video. Generally, you will have a choice of server specs, operating system, RAM, etc. It's like owning your own computer, but physically located at the hosting company rather than at your business. This is for only the heaviest website needs.
Below are hosting companies that offer dedicated servers.