These proxies are called dedicated proxies because they are used by only one user. The dedicated nature of these proxies make them ideal for social media, SEO and marketing, botting, gaming, and more. They perform better than other types of proxies in terms of speed.
The characteristics of these proxies are the same as dedicated proxies, however, they are shared between a group of 3 users. As they are shared they are not as fast as the other two types of proxies and works well for basic anonymous browsing and similar activities.
These proxies rotate its public IP address with IP addresses obtained from a pool IP that are connected to a single IP:Port purchased by a user. They are used for activities that require having multiple different IPs being associated to the rotating proxy port. Having a larger pool of IPs to work with, would increase the chances of getting better desirable results in the process.