Surface Mount Resistors are small electronic components used to limit the flow of electric current in circuits. Unlike traditional through-hole resistors, they are designed to be mounted directly onto the surface of a printed circuit board (PCB), which saves space and allows for more compact designs. These resistors come in various sizes and resistance values, making them versatile for different applications. They are typically made from materials like carbon or metal film, providing stability and reliability in electronic devices, from smartphones to computers.