Validation
Validation is a software development concept that involves checking data or inputs against defined rules or constraints to ensure they are correct, complete, and secure before processing. It is commonly used in forms, APIs, databases, and user interfaces to prevent errors, enhance security, and improve user experience. Techniques include client-side validation (e.g., in web browsers) and server-side validation (e.g., in backend systems).
Developers should learn validation to build robust applications that handle user inputs safely, such as preventing SQL injection, cross-site scripting (XSS), or invalid data entries in forms. It is essential in scenarios like user registration, payment processing, and data import/export to maintain data integrity and comply with regulations like GDPR. Without validation, applications are vulnerable to security breaches and functional errors.