All these words involve at least two parties, where a commitment or promise can be the act of one. A contract is a formal agreement between two or more parties on whether to do or leave a particular act or actions and is usually in writing. Mutual promises can have the power of a contract. Consideration or compensation is essential to convert an agreement into a contract. A contract may be concluded orally or in writing. A contract in law is a written contract under seal. The covenant is often used for religious purposes, such as contract in law and business. Compact is essentially the same as treated, but applies to international agreements, treaties, etc. An agreement is a reciprocal agreement for an exchange of values, without the formality of a treaty. A provision is a single point of an agreement or contract. A cartel is a military agreement for the exchange of prisoners or others. Again, they looked at each other as consensual with meaning on their faces. .