Reed-Solomon Code is a type of error-correcting code used to ensure data integrity in digital communications and storage. It works by adding extra data, called redundancy, to a message. This redundancy allows the system to detect and correct errors that may occur during transmission or storage, making it especially useful in applications like CDs, DVDs, and QR codes. The code is based on polynomial mathematics and operates over finite fields. By encoding data into symbols, Reed-Solomon Code can recover lost or corrupted information, even if parts of the data are missing. This makes it a powerful tool for reliable data transmission and storage.