Hyperledger is an umbrella project of open-source blockchains and related tools, hosted by the Linux Foundation. It was created to support the collaborative development of blockchain-based distributed ledgers. Hyperledger doesn’t refer to a specific technology, but rather to a suite of tools and frameworks for building blockchain applications.
Notable projects under Hyperledger include Hyperledger Fabric, Hyperledger Sawtooth, and Hyperledger Indy, each serving different use cases like enterprise blockchain solutions, supply chain management, and digital identity, respectively. Hyperledger aims to provide the necessary infrastructure and standards to develop blockchain solutions in various industries.