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A mutual exchange of promises where each party commits to fulfilling certain obligations to the other party.

A contract in which some obligations have not yet been performed by one or more parties.

An agreement without legal effect, because it violates a fundamental principle of contract law or is illegal.

A contract explicitly stated and agreed upon by the parties, either orally or in writing, detailing the terms explicitly.

An agreement that may be annulled by one of the parties due to certain legal deficiencies.

An agreement created by actions of the parties involved, where terms are not expressly stated but can be inferred from the circumstances.

A contract that is valid but cannot be enforced due to certain legal defenses.

A contract where one party makes a promise in exchange for the other's performance, rather than a promise.

An agreement in which all parties have fulfilled their obligations.

An agreement where the purchaser agrees to pay the cost of the work plus a fixed fee or percentage as profit.

A contract where performance is contingent upon the occurrence of a certain event, which may or may not happen.

A contract with a set price that does not change regardless of the costs incurred by the contractor.

A contract offering one party the opportunity to enter into another contract in the future.

A contract in which a seller agrees to sell all of its production to a single buyer.

A contract in which one party agrees to secure the other against loss or damage.

A standardized contract offered on a take-it-or-leave-it basis by a party with stronger bargaining power, often considered unfair to the weaker party.

A contract in which a buyer agrees to purchase all of their required goods from one seller.

A contract that provides additional payment or a reward for achieving performance targets or efficiencies.

A contract where payment is based on the time spent and the materials used to perform the work.