Symmetric Multiprocessors (SMP) are computer systems that use multiple processors to perform tasks simultaneously. In an SMP architecture, all processors share a common memory space and have equal access to the system's resources, allowing them to work on different parts of a program at the same time. This design enhances performance and efficiency, especially for multi-threaded applications. SMP systems are commonly used in servers and high-performance computing environments. They can scale easily by adding more processors, which helps improve processing power without significant changes to the software. This makes SMP a popular choice for applications requiring high reliability and speed.