Explain the basic input validation approaches?

Input validation is a fundamental security measure in application and business security developments. It helps prevent security vulnerabilities such as SQL injection, cross-site scripting (XSS), and buffer overflow attacks. By ensuring that only properly formatted and expected data is processed, businesses can significantly reduce the risk of security breaches. Several approaches are commonly used for input validation, each with its specific advantages and applications.

One of the most effective input validation approaches is whitelisting (allowlist). This method defines a strict set of acceptable values or formats for input data. If the input does not match the predefined criteria, it is rejected. Whitelisting is highly secure because it allows only known safe inputs while blocking all others. For example, in a business application that accepts user IDs, ______ ________ __________ _____ ________ ____ ________ ____ ______ _____.
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