SMT, or Surface Mount Technology, is a method used in electronics to mount components directly onto the surface of printed circuit boards (PCBs). This technique allows for smaller and lighter devices, as components can be placed more densely compared to traditional through-hole mounting. The process involves soldering components onto the PCB using automated machines, which increases production speed and efficiency. SMT is widely used in various electronic devices, including smartphones, computers, and appliances, making it a crucial technology in modern manufacturing.