This tag should be used for questions related to multi signature transactions. Multisig transactions allow for multiple people to sign a transaction before the transaction can be considered valid.
A multi signature transaction is a transaction which spends from a multi signature address. The multisig address is an address which requires one or more signatures which correspond to public keys provided in the address. For example, a multisig address can require 2 out of 3 people to provide signatures in order for the funds to be spent. Due to restrictions on script lengths, the maximum multisig address can have 15 participants.