In chess, the king is the most invaluable piece; however, it is also the most vulnerable piece in chess because it is only able to move one square at a time, and it has no unique ability to move efficiently from one end of the board to the other. It is the most restricted piece on the board.
The queen is the most powerful, which means someone is working behind the king that holds the true power. The king is both the most important, but the weakest piece in chess. No single move can prevent the king from being attacked.