PKCS#5 is a standard for password-based encryption that provides a method for securely encrypting data using a password. It defines how to derive a cryptographic key from a password and how to use that key to encrypt and decrypt data. This standard is widely used in various applications to protect sensitive information. The main feature of PKCS#5 is its use of a key derivation function, which applies a hashing algorithm multiple times to make it more difficult for attackers to guess the password. This process enhances security by increasing the computational effort required to crack the encryption, making it a reliable choice for protecting data.