Ed25519 is a public-key signature system that is designed for high performance and security. It uses the Elliptic Curve Cryptography (ECC) method, specifically the Curve25519, which allows for fast signing and verification of digital signatures. This makes it suitable for various applications, including secure communications and data integrity. One of the key features of Ed25519 is its resistance to common cryptographic attacks, making it a reliable choice for developers. It also has a fixed key size of 256 bits, which balances security and efficiency. Overall, Ed25519 is widely adopted in modern cryptographic protocols and systems.