The term "Power Supply Form Factor" refers to the physical size, shape, and layout of a power supply unit (PSU) in a computer or electronic device. Different form factors ensure compatibility with various cases and motherboards, affecting how the PSU fits and connects within the system. Common form factors include ATX, SFX, and TFX, each designed for specific applications and space constraints. Understanding the power supply form factor is crucial for building or upgrading a computer. Choosing the right form factor ensures that the PSU can be securely mounted and properly connected to other components, such as the motherboard and graphics card, providing reliable power for optimal performance.