The "Worst-Fit" algorithm is a memory allocation strategy used in computer systems to manage free memory blocks. When a program requests memory, this method searches for the largest available block that can accommodate the request. By using the largest block, it aims to leave smaller fragments of memory available for future allocations. This approach contrasts with other strategies like Best-Fit and First-Fit, which focus on smaller or first available blocks, respectively. While Worst-Fit can help reduce fragmentation in some cases, it may lead to inefficient use of memory, as larger blocks can become underutilized over time.