A more thorough explanation:

A proposal is something that is suggested or offered for someone to consider or accept.

For example, a company might submit a proposal to a client for a new project they want to work on together. The proposal would outline the details of the project, including the timeline, budget, and goals.

Another example could be a student proposing a new club to their school administration. The proposal would explain the purpose of the club, the activities it would involve, and the benefits it would bring to the school community.

These examples illustrate how a proposal is a formal way of presenting an idea or plan to someone else for their consideration or acceptance.