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Input validation is a fundamental component of application and business security, as it ensures that the data entering a system is accurate, expected, and safe for further processing. Applications constantly interact with external inputs such as user forms, APIs, or uploaded files, and if these inputs are not validated properly, they can become avenues for attacks like SQL injection, cross-site scripting (XSS), buffer overflows, or business logic abuse. Therefore, input validation not only protects the integrity of applications but also safeguards sensitive business data and operations. Various approaches are used to validate input, each contributing to a layered defense strategy. One of the most common approaches is whitelisting, also called allow-list validation. In this method, only explicitly defined valid inputs are accepted, while all others are rejected. For example, if a field requires a phone number, the system will allow only numeric characters of a ____ _________ _________ ____ ______ ___ ___ ___ ______ ________ __________ ______.
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