In Creative Mode, players have an infinite amount of resources to build with, with no health or hunger to hamper their building and the ability to destroy all blocks instantly (including normally indestructible blocks like Bedrock) as long as they are not wielding a sword or tridentCreative mode gives you unlimited resources, free flying and lets you destroy blocks instantly when miningChanging Your Gamemode Through The In Game Chat If you are an OP within the server, you can run the following commands in chat to change your game mode:
Minecraft Bukkit Server Commands Building Minecraft Server Modifications