A Single-Board Computer (SBC) is a complete computer built on a single circuit board. It includes essential components like the processor, memory, and input/output interfaces. SBCs are often used in embedded systems, robotics, and educational projects due to their compact size and low cost. Popular examples of SBCs include the Raspberry Pi and Arduino. These devices allow users to run various operating systems and software applications, making them versatile for hobbyists and professionals alike. SBCs are ideal for prototyping and developing new technologies in a wide range of fields.