A document that is written for problem solving, service provision, event planning, or equipment selling. Generally, proposals are used to convince the reader to do what the proposal suggests, such as buying goods or services, funding a project, or implementing a program. Proposals in the professional world are used for internal (within an organization) and external (from one organization to another) purposes. They are ways of generating income for companies or seeking funding for projects. This is provided to the sponsor of the project for approval.