What are the respective roles and responsibilities of the promisor and promisee in a contractual agreement?

In a contractual agreement, the promisor is the party making a promise to do something, while the promisee is the party to whom the promise is made. The promisor is responsible for fulfilling the promise, while the promisee is entitled to expect that the promise will be kept. Both parties have a duty to act in good faith and abide by the terms of the contract.