A "milestone" is a significant event or point in a process that marks progress or achievement. It is often used in project management to indicate the completion of a key phase or task. Milestones help teams track their progress and ensure that they are on schedule. In personal development, milestones can refer to important life events, such as graduating from school or starting a new job. These moments are often celebrated as they represent growth and accomplishment. In both contexts, milestones serve as markers that help individuals and groups recognize their achievements and plan for future goals.