Input validation - GCSE Computer Science Definition

Input validation is the process of checking and ensuring that the data entered into a computer system is correct, useful, and safe. Imagine it like a security check for information, making sure that any data given by the user meets the rules of what's allowed and expected. For instance, if a computer program asks for your age, input validation ensures you can't type in something silly like negative numbers or words. It's important because it helps to prevent mistakes and protects the computer systems from hackers trying to enter harmful data. In the world of GCSE Computer Science, understanding input validation helps you create better, safer programs.