Dedicated server is the practice of having a unique IP and specific server serving only for you, while in non dedicated server a number of websites and people can benefit from the same server. Since you share ark non dedicated server, you will not have the opportunity to use the total assets of the server.
An Ark Dedicated server is a server used to play the online game Ark: Survival Evolved. The server is hosted by a company or individual, and players connect to it to play the game. A dedicated server usually has better performance and stability than a shared server, and can be customized to the player's needs.