Have you ever tried to open a file and seen a message like “Access Denied” ? Or wondered how your operating system stops one app or user from changing important system files? This protection is handled by file permissions — a quiet but powerful security feature built into every modern operating system. In this post, we’ll explain file permissions in simple terms , why they exist, and how they protect your data in today’s multi-user, app-heavy world. What Are File Permissions? File permissions define who can do what with a file or folder. They control actions such as: Reading a file Modifying a file Deleting or executing a file Every file stored on your computer has rules attached to it. These rules are checked every time someone or something tries to access that file. Without permissions, any program could modify or delete critical data, which would be dangerous. Why Operating Systems Use File Permissions Modern systems are used by: Multiple users Hundr...
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