What is least privilege and why important?

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Least privilege means granting users only the minimum access they need to perform their jobs, with permissions reviewed and adjusted regularly as roles change. This minimizes the potential impact of mistakes or compromised credentials by limiting what a user can access and do. Regular reviews ensure access stays aligned with current duties and removes permissions that are no longer needed. The other options miss the core idea: giving broad access to speed things up increases risk; giving everyone access to everything defeats the purpose; and focusing only on password strength ignores who has access to data and resources.