A threshold scheme is a cryptographic method used to secure sensitive information, such as keys or secrets. In this scheme, a secret is divided into multiple parts, or shares, and distributed among a group of participants. To reconstruct the original secret, a minimum number of shares, known as the threshold, must be combined. This ensures that no single participant can access the secret alone, enhancing security. These schemes are commonly used in various applications, including secure voting systems and distributed storage. For example, in a Shamir's Secret Sharing scheme, a secret can be split into shares, allowing only a specified number of participants to collaborate to recover the original information.