CPU fan is a cooling component designed to dissipate heat from the processor, preventing overheating and ensuring optimal performance. It is typically mounted on a heatsink and works by drawing heat away from the CPU using airflow. CPU fans come in various sizes (80mm, 120mm, 140mm) and can be controlled via PWM (4-pin) or DC (3-pin) connections. They are essential for maintaining system stability, reducing thermal throttling, and prolonging the lifespan of the CPU. High-performance fans may feature RGB lighting, fluid dynamic bearings, or magnetic levitation technology for enhanced efficiency and quieter operation.

USB Hub is a device that expands a single USB port into multiple ports, allowing users to connect multiple peripherals such as flash drives, keyboards, mice, and external hard drives to a computer or other USB-enabled device. It can be bus-powered (drawing power from the host device) or self-powered (using an external power adapter). USB hubs come in various versions, including USB 2.0, USB 3.0, and USB-C, offering different data transfer speeds and functionalities. They are commonly used for increasing connectivity in laptops, PCs, and gaming consoles.