IPFS (InterPlanetary File System) is a peer-to-peer protocol and network designed to create a content-addressable, decentralized method of storing and sharing hypermedia in a distributed file system. In the context of blockchain, IPFS can be used to store large amounts of data off-chain in a secure and decentralized manner, while still being able to reference and access this data through the blockchain. This helps in improving scalability and reducing the burden on the main blockchain network by offloading data storage to IPFS.