High-speed board typically refers to a printed circuit board that is specifically designed and engineered to support high-frequency or high-speed electronic signals and data transmission. 

High-speed boards are commonly used in various applications, including data communication equipment, networking devices, high-speed data buses, graphics cards, memory modules, and other electronic systems where rapid data transfer and signal quality are essential. Designing and manufacturing high-speed boards requires specialized knowledge and expertise to ensure the reliable performance of electronic systems operating at these high frequencies.