Hardware compatibility refers to the ability of different computer components and devices to work together without issues. This includes ensuring that parts like the CPU, motherboard, RAM, and graphics card can communicate effectively. When components are compatible, they can function as a cohesive system, allowing users to upgrade or replace parts easily. To determine hardware compatibility, users often check specifications and standards, such as PCIe slots for graphics cards or DDR types for memory. Manufacturers usually provide compatibility lists, helping users select components that will work together seamlessly, thus avoiding performance problems or system failures.