Signature aggregation is a method of combining multiple digital signatures into a single signature. It is a way of reducing the size and the cost of digital signature schemes, by allowing multiple parties to sign a message or a transaction using a single signature. Signature aggregation is commonly used in cryptography and blockchain technology, where it is used to improve the efficiency and the security of digital signature schemes. In signature aggregation, multiple parties can create their own signatures on a message or a transaction, and then the signatures can be combined into a single signature using a mathematical operation. This allows for more efficient and secure processing of transactions, as the size and the cost of the signature is reduced. Signature aggregation is an important research area in cryptography and blockchain technology, and it has many potential applications.