Error-Correcting Codes are techniques used in computer science and telecommunications to detect and correct errors that may occur when data is transmitted or stored. These codes add extra bits to the original data, allowing the system to identify and fix mistakes without needing to resend the entire message. This is crucial for ensuring the accuracy and reliability of information, especially in noisy environments. For example, when you send a message over the internet, Error-Correcting Codes help ensure that the message arrives intact, even if some bits get altered during transmission. By using these codes, systems can maintain data integrity, making communication more efficient and trustworthy.