The kernel is a computer program that is the core of a computer's operating system, with complete control over everything in the system. It is the first program loaded on start-up. It handles the rest of start-up as well as input/output requests from software, translating them into data-processing instructions for the central processing unit. It handles memory and peripherals like keyboards, monitors, printers, and speakers. Security companies that provide kernel-level protection can protect against hte most advanced and targeted cyber attacks.