Encryption is the process of converting readable information, known as plaintext, into an unreadable format called ciphertext. This transformation uses algorithms and keys to ensure that only authorized parties can access the original data. Encryption protects sensitive information, such as personal data, financial details, and communications, from unauthorized access or cyberattacks. It is widely used in online banking, messaging apps, and secure websites. However, advances in technology, like quantum computing, could potentially break many current encryption methods, making ongoing innovation in this field essential.