What is be all end all?

"Be all end all" is an idiomatic expression used to describe something that is regarded as the most important, crucial, or decisive element in a particular situation or activity. It is often used to emphasize the final or ultimate outcome of a situation or decision. The phrase can be used in various contexts such as in sports, business, politics, or personal life. In general, it signifies the ultimate culmination of a process or event, which will determine the final and complete outcome.