The purpose of the "difficulty adjustment" mechanism in Bitcoin's protocol is to ensure that new blocks are added to the blockchain at a relatively constant rate, approximately every 10 minutes. This mechanism dynamically adjusts the difficulty of solving the cryptographic puzzles required to mine new blocks based on the network's total mining power. If more miners join the network, the difficulty increases to maintain the block time; likewise, if miners leave the network, the difficulty decreases. This adjustment mechanism helps to keep the Bitcoin network secure and stable.
