A power of attorney (POA) or letter of attorney is a written authorization to represent or act on another's behalf in private affairs, business, or some other legal matter, sometimes against the wishes of the other. The person authorizing the other to act on behalf of him or her is the principal, grantor, or donor (of the power). The one authorized to act is the agent or, in some common law jurisdictions, the attorney-in-fact (attorney for short). Formerly, a power referred to an instrument under seal while a letter was an instrument under hand, but today both are signed by the grantor, and therefore there is no difference between the two.

A memorandum of understanding (MoU) is describing a bilateral or multilateral agreement between two or more parties. It expresses a convergence of will between the parties, indicating an intended common line of action. It is often used in cases where parties either do not imply a legal commitment or in situations where the parties cannot create a legally enforceable agreement. It is a more formal alternative to a gentlemen's agreement.

A letter of intent (LOI or LoI, and sometimes capitalized as Letter of Intent in legal writing, but only when referring to a specific document under discussion) is a document outlining an agreement between two or more parties before the agreement is finalized. The concept is similar to a heads of agreement. Such agreements may be Asset Purchase Agreements, Share Purchase Agreements, Joint-Venture Agreements, Lease Agreements, and overall all Agreements which aim at closing a financially large deal.

A distribution agreement, also known as a distributor agreement, is a contract between channel partners that stipulates the responsibilities of both parties. The agreement is usually between a manufacturer or vendor and a distributor but in some cases may involve two distributors or a distributor and some other channel entity.The basic elements of a distribution agreement include the term (time period for which the contract is in effect), terms and conditions of supply and exclusivity or non-exclusivity. An exclusivity agreement, for example, stipulates that the specified distributor will be the only one with the right to sell the product within a particular geographic area.

An exclusivedistribution agreement can impose limits on one or both signatories. The restriction can apply to from whom the individual or business can purchase or buy a specific product, or who can represent certain interests. Such contracts must not curtail competition in the marketplace to be deemed legal.

A non-exclusive distribution agreement is a legal agreement issued for intellectual/creative work, in which the rights of usage for that particular work are issued to several parties. This is the opposite of an exclusive Distribution Agreement, where one party within a certain field is given specific rights with regards to a certain piece of work.

An agency agreement is a legal contract creating a fiduciary relationship whereby the first party ("the principal") agrees that the actions of a second party ("the agent") binds the principal to later agreements made by the agent as if the principal had himself personally made the later agreements. The power of the agent to bind the principal is usually legally referred to as authority. Agency created via an agreement may be a form of implied authority, such as when a person gives their credit card to a closerelative, the cardholder may be required to pay for purchases made by the relative with their credit card.

A sales contract is a legal contract an exchange of goods, services or property to be exchanged from seller (or vendor) to buyer (or purchaser) for an agreed upon value in money (or money equivalent) paid or the promise to pay same. It is a specific type of legal contract.An obvious ancient practice of exchange, in many common-law jurisdictions it is now governed by statutory law. See commercial law.Contracts for sale involving goods are governed by Article 2 of the Uniform Commercial Code in most United States and Canadian jurisdictions, however in Quebec such contracts are governed by the Civil Code of Quebec as a nominate contract in the book on the law of obligations.

A franchise agreement is a legal, binding contract between a franchisor and franchisee, enforced in the United States at the State level.Prior to a franchisee signing a contract, the US Federal Trade Commission regulates information disclosures under the authority of The Franchise Rule.The Franchise Rule requires a franchisee be supplied a Uniform Franchise Offering Circular (UFOC) or Franchise Disclosure Document (FDD) prior to signing a franchise agreement, a minimum of ten days before signing a franchise agreement.Once the Federal ten day waiting period has passed, the Franchise Agreement becomes a State level jurisdiction document. Each state has unique laws regarding franchise agreements.A franchise agreement contents can vary in content depending upon the franchise system, the state jurisdiction of the franchisor, franchisee, and arbitrator.

A non-disclosure agreement (NDA), also known as a confidentiality agreement (CA), confidential disclosure agreement (CDA), proprietary information agreement (PIA), or secrecy agreement, is a legal contract between at least two parties that outlines confidential material, knowledge, or information that the parties wish to share with one another for certain purposes, but wish to restrict access to or by third parties. It is a contract through which the parties agree not to disclose information covered by the agreement. An NDA creates a confidential relationship between the parties to protect any type of confidential and proprietary information or trade secrets. As such, an NDA protects nonpublic business information.NDAs are commonly signed when two companies, individuals, or other entities (such as partnerships, societies, etc.) are considering doing business and need to understand the processes used in each other's business for the purpose of evaluating the potential business relationship. NDAs can be "mutual", meaning both parties are restricted in their use of the materials provided, or they can restrict the use of material by a single party.It is also possible for an employee to sign an NDA or NDA-like agreement with an employer. In fact, some employment agreements will include a clause restricting employees' use and dissemination of company-owned confidential information.

A patent assignment agreement is intended to assign a patent to a company. The assignment must be supported by separate consideration which may be a nominal amount or a larger value.

A trademark license is an agreement between a trademark owner (the "licensor") and another person or business entity (the "licensee") in which the licensor gives permission to the licensee to use its trademark or trademarks in commerce.