Bose-Chaudhuri-Hocquenghem Codes, or BCH codes, are a type of error-correcting code used in digital communications and data storage. They help detect and correct errors that may occur when data is transmitted or stored. BCH codes are particularly effective because they can correct multiple errors in a block of data, making them valuable for ensuring data integrity in various applications, such as CDs, DVDs, and QR codes. These codes are constructed using polynomial mathematics over finite fields, which allows for efficient encoding and decoding processes. The flexibility of BCH codes enables them to be tailored for specific error correction needs, making them a popular choice in modern technology where reliable data transmission is crucial.