**What is the primary function of encryption algorithms?**
The primary function of **encryption algorithms** is to convert plaintext data into an unreadable format called ciphertext to protect the information from unauthorized access. By applying mathematical transformations, these algorithms ensure that only authorized users with the appropriate decryption keys can access the original data. Encryption plays a vital role in maintaining data confidentiality in various applications, including secure communications, online transactions, and data storage. Common encryption algorithms include AES, RSA, and SHA, each serving different security requirements and use cases.