Can you describe the main types of encryption methods and their purposes?

The main types of encryption methods include:

1. Symmetric encryption — uses the same key for encrypting and decrypting data. Fast and suitable for large data volumes. Examples: AES, DES.
2. Asymmetric encryption — uses a pair of keys: a public key for encryption and a private key for decryption. Ensures secure key exchange and digital signatures. Examples: RSA, ECC.
3. Hashing — one-way transformation of data into a fixed-length hash. Used for integrity verification and password storage. Examples: SHA-256, MD5.
4. Digital signature — combines hashing and asymmetric encryption to verify authenticity and integrity.

Each method serves its purpose: symmetric for fast encryption, asymmetric for secure key exchange and authentication, hashing for data verification.