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A collective agreement is an agreement made between an employer (or employers' association) and a trade union governing the relationship between the parties. It will only be legally binding upon the parties if in writing and if it states it has legal status. Some of the terms and conditions of individual employment of those employees may be covered by a collective agreement. (Legal Glossary by Clickdocs)

Supplemental agreements are legally binding documents that are used to modify contracts that are already in force. This type of document is sometimes used as a means of allowing the existing agreement to remain in place with the same ending date, while adding or removing some provisions or terms to the working relationship. A supplemental agreement is often an ideal solution when there is no desire to renegotiate an entirely new contract to take the place of the current agreement. (WiseGEEK)

Prenuptial agreements should be legally binding in divorce settlements, but only after the needs of the separating couple and any children have been taken into account, the Law Commission has recommended. (The Guardian)

If you own a business, you will have to enter into many contracts with vendors, customers and other parties. A business contract is a legally binding agreement between two parties, usually for the provision of goods and services or both. (findlaw.co.uk)