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

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

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

An agreement in which all parties have fulfilled their obligations.

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

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

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

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

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

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

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

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

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

An agreement where a third party agrees to fulfill the obligations of a debtor to a lender, if the debtor fails to fulfill them.

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

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

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

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