NTRUEncrypt is a public-key cryptosystem that uses lattice-based mathematics to secure data. It was designed to be efficient and resistant to attacks from quantum computers, making it a promising alternative to traditional encryption methods like RSA and Elliptic Curve Cryptography. The system works by generating a pair of keys: a public key for encryption and a private key for decryption. NTRUEncrypt is known for its fast performance and smaller key sizes, which contribute to its effectiveness in various applications, including secure communications and data protection.