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Input validation is a fundamental security measure in application and business systems development, as it ensures that the data entering a system is accurate, properly formatted, and safe for processing. Without proper validation, applications become vulnerable to a wide range of attacks, such as SQL injection, cross-site scripting, buffer overflows, and logic manipulation. Basic input validation approaches aim to enforce data integrity, mitigate malicious input, and prevent unintentional errors that can disrupt business operations. One of the most common approaches is whitelisting, which defines a set of acceptable inputs and rejects anything that does not conform to the expected pattern. For example, if a field requires a phone number, the system should only accept digits and possibly a few special characters like plus signs or hyphens. Whitelisting is considered the safest method because it explicitly restricts data to predefined ________ __________ __________ ________ _____ _____ ___.
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