The term "best efforts" refers to a high level of effort or commitment made towards achieving a particular goal. It implies that everything possible will be done to ensure success, and no stone will be left unturned in making an attempt. In legal contracts, the phrase is often used to describe the obligations of each party involved, where they must use their best efforts to fulfill their respective duties. Essentially, it means doing one's utmost to achieve a desired outcome or reach a target.