The kernel schedules when each application runs. In operating systems, scheduling is the process of deciding which program or process gets access to the CPU and for how long. This is essential for multitasking, where many applications appear to run at the same time. The kernel contains the process scheduler, which manages ready queues, assigns CPU time slices, handles context switching, and enforces priority rules so that system tasks and user applications run smoothly. In Information Technology, this function is part of core resource management, alongside memory management and device coordination. The user interface controls how the system is presented to users, such as command-line or graphical interfaces. The file manager focuses on storing, retrieving, and organizing files and folders. Drivers translate operating system commands into device-specific actions for hardware such as keyboards, printers, and disk controllers. Since scheduling is a core OS responsibility handled internally, the correct component is the kernel.