En un contrato, hay dos participantes, ¿como se denominan?

On face value, there are two main parties, the promisor, who makes a promise, and the promisee, who receives the benefits of a contract. Both parties also hold an obligation to the contract. Sometimes, a third-party beneficiary benefits from a contract.

Explanation:

always in school geography and mathematics.

( i don't know what exactly this means but i translated it : d )

de pequeño me gustaba jugar con jugetes