There are two places where hyperledger stores data: the ledger, and the state database
The ledger is the actual "blockchain" The state database (or 'World State') holds the last known committed value for any given key - an indexed view into the chain’s transaction log Differences between composer and fabric composer is a simplified approach of development on top of the fabric blockchain architecture. While composer is a high level develpment framework, fabric is low level chain code develpment.