A tender brief is when a client publishes details of a project they want completed and invites companies to submit proposals or "pitches" for how they would complete the project. Companies then submit their ideas and estimated costs to the client. The client will review all the submissions and select the proposal they feel best meets their needs and criteria, whether that be the cheapest bid or the one with the highest quality. This allows the client flexibility in choosing the best company for the job from a range of options and ideas.