Encryption
Encryption is a fundamental security technique that transforms readable data (plaintext) into an unreadable format (ciphertext) using algorithms and keys, ensuring confidentiality and integrity during storage or transmission. It is widely applied in areas like secure communications, data protection, and authentication systems to prevent unauthorized access and tampering.
Developers should learn encryption to implement security in applications handling sensitive data, such as user passwords, financial transactions, or personal information, to comply with regulations like GDPR or HIPAA. It is essential for building secure web applications (e.g., using HTTPS), encrypting databases, and developing privacy-focused features like end-to-end messaging.