Shamir's Secret Sharing is a cryptographic method that allows a secret to be divided into multiple parts, or shares, so that only a specific number of shares are needed to reconstruct the original secret. This technique ensures that no single share reveals any information about the secret, enhancing security. The process involves a polynomial function where the secret is the constant term, and each share corresponds to a point on the polynomial. To recover the secret, a predetermined number of shares must be combined using Lagrange interpolation, making it a robust solution for secure information sharing among a group.