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Input validation is a fundamental security practice in application and business security that ensures only properly formatted, expected, and authorized data is accepted by an application. Since user input is one of the most common sources of security vulnerabilities, proper validation helps prevent attacks such as SQL injection, cross-site scripting (XSS), command injection, buffer overflows, and data corruption. Input validation should be applied to all external data sources, including web forms, APIs, cookies, files, databases, and network requests. Effective input validation improves application reliability, protects sensitive business information, and enhances overall system security. One of the basic input validation approaches is whitelist validation, also known as positive validation. This approach specifies exactly what type of input is considered acceptable and rejects everything else. Validation rules may define permitted characters, maximum and minimum lengths, numerical ______ _____ ________ _____ _________ ____ ___ _____ ______ __________ ________ ______.
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