What is project proposal and its contents?

Project proposal has one aim which is to determine the feasibility of a project.

The project proposal consists of answers to the following questions:

- What is the proposed solution?
- What is the goal?
- Alignment with strategy?

A detailed explanation of the project proposal can be found here: http://www.pmhut.com/how-to-write-a-project-proposal (sorry can't copy the article).