Shamir's Secret Sharing, also known as key splitting, is a method of dividing a secret, such as a password or a private key, into multiple shares. The secret can then be reconstructed by combining a certain number of shares, known as the threshold. This allows for secure sharing of a secret among a group of people, as each person only has access to one share of the secret, and the secret cannot be reconstructed without the required number of shares. Shamir's Secret Sharing is named after its inventor, Adi Shamir, and it is a widely-used method for secure sharing of secrets. It is commonly used in cryptography, blockchain technology, and other applications where secure sharing of sensitive information is needed.