What are the key differences in power and strategic importance between the chess king and queen?

The key differences in power and strategic importance between the Chess king and queen are that the queen is the most powerful piece on the board, able to move in any direction and cover long distances, while the king is the most important piece, as the game is lost if it is captured. The queen is often used for aggressive attacks and controlling the board, while the king is primarily focused on protection and defense.