System boot refers to the process that occurs when a computer or device is powered on. During this time, the system performs a series of checks and initializations to ensure that all hardware components, such as the CPU, RAM, and hard drive, are functioning correctly. This process is crucial for preparing the system to load the operating system. Once the hardware checks are complete, the system locates the bootloader from the hard drive or other storage devices. The bootloader then loads the operating system into memory, allowing the user to interact with the device. This entire sequence is essential for the proper functioning of any computer system.