Encryption is a security technique that converts readable data into coded form that can only be decoded by someone with the correct key. This protects sensitive information from unauthorized access, whether stored on devices or transmitted over networks. Modern encryption uses complex mathematical algorithms that would take impossibly long to break without the proper key. Examples include: encrypted websites (HTTPS) protecting online transactions, encrypted messaging apps protecting private conversations, and encrypted storage protecting data on lost or stolen devices. Government organizations handling personal information must use encryption to protect citizen data. Encryption is essential for online banking, e-commerce, and secure communication. While encryption protects privacy and security, debates arise about law enforcement access to encrypted communications and balancing privacy with public safety needs.