SSTF Scheduling, or Shortest Seek Time First Scheduling, is a disk scheduling algorithm used to manage how data is read from a hard drive. It prioritizes requests based on the shortest distance the read/write head must move to access the data. This approach minimizes the time spent moving the head, which can improve overall system performance. In SSTF, when a request is made, the algorithm evaluates all pending requests and selects the one closest to the current position of the head. This method can lead to faster response times but may cause some requests to wait longer, especially if they are far from the current head position.