Threading Building Blocks (TBB) is a C++ library developed by Intel that simplifies parallel programming. It provides a high-level abstraction for managing threads, allowing developers to focus on the logic of their applications rather than the complexities of thread management. TBB uses a task-based model, where tasks are dynamically scheduled across available processor cores. This approach helps optimize performance by efficiently utilizing system resources, making it easier to write scalable and portable code for multi-core processors.