BCH codes, or Bose–Chaudhuri–Hocquenghem codes, are a type of error-correcting code used in digital communications and data storage. They help detect and correct errors that may occur during data transmission or storage, ensuring that the information remains accurate. BCH codes are particularly useful in applications where data integrity is critical, such as in CDs, DVDs, and QR codes. These codes are constructed using polynomial mathematics, allowing them to correct multiple random errors in a block of data. The flexibility of BCH codes enables them to be tailored for different levels of error correction, making them a popular choice in various technologies, including wireless communication and data compression.