Shortest Job First (SJF) is a scheduling algorithm used in operating systems to manage processes. It prioritizes jobs based on their execution time, allowing the process with the shortest duration to run first. This approach minimizes the average waiting time for all processes, making it efficient for batch processing. However, SJF can lead to the starvation of longer processes, as they may be continually preempted by shorter jobs. Additionally, it requires knowledge of the execution time of processes in advance, which is not always feasible. Despite these challenges, SJF is effective in environments where job lengths are predictable.