RSA (Rivest–Shamir–Adleman) is one of the first and most trusted public-key cryptographic systems. It relies on the mathematical difficulty of factoring large prime numbers to encrypt and decrypt data securely. RSA is commonly used in SSL/TLS certificates, VPNs, and email encryption to protect sensitive information exchanged over the Internet. Learn more: https://en.wikipedia.org/wiki/RSA_(cryptosystem)