Ultra Hardcore, or UHC (Ultra Hardcore Challenge), is a PvP minigame which allows most activities of normal survival, except that players do not regenerate health naturally. Players must either complete the game or defeat all the other players or teams.
Creative mode strips away the survival aspects of Minecraft and allows players to easily create and destroy structures and mechanisms with the inclusion of an infinite use of blocks and flying. It also changes the background music.
you mine and chop down trees to get money and eventually rankup. This type of Server is best for the type of player that loves ranks, and a goal to get to. Prison Servers can be nice, usually have a nice community.