RSA is a widely used method for securing digital information through encryption. It relies on the mathematical properties of prime numbers to create a pair of keys: a public key, which anyone can use to encrypt messages, and a private key, which only the intended recipient possesses to decrypt those messages. This ensures that even if someone intercepts the encrypted message, they cannot read it without the private key. The strength of RSA lies in its complexity; breaking the encryption would require an enormous amount of computational power. This makes it a popular choice for securing online communications, such as in SSL/TLS protocols used for safe web browsing and in email encryption.