Efficiency Cores are specialized processing units designed to handle less demanding tasks while consuming less power. They are part of modern computer architectures, such as those found in ARM and Intel processors, allowing devices to perform everyday functions without draining battery life. This makes them ideal for mobile devices and laptops. These cores work alongside more powerful cores, known as Performance Cores, to optimize overall system performance. By distributing tasks based on their complexity, Efficiency Cores help improve multitasking and enhance energy efficiency, ultimately leading to longer battery life and better user experiences in devices like smartphones and tablets.