7:What applications are used by Hyperledger Fabric to communicate with the blockchain network?

Hyperledger Fabric uses the following applications to communicate with the blockchain network:

1. Chaincode (Smart Contracts): Chaincode is a program, written in Go, Node.js, or Java that implements a prescribed interface. Chaincode runs on a peer and encapsulates the business logic of a system. It is this code that the clients of a Hyperledger Fabric network interact with.

2. Software Development Kits (SDKs): Hyperledger Fabric provides SDKs for a number of languages, including Go, Node.js, and Java. These SDKs include APIs for interacting with a Hyperledger Fabric network, such as submitting transactions, querying the ledger, and managing channels and users.

3. Command Line Interface (CLI): The Hyperledger Fabric CLI is a powerful tool for interacting with a network. It provides commands for managing chaincode, channels, and users, as well as for querying the ledger and submitting transactions.

4. REST APIs (via Hyperledger Fabric SDKs): Hyperledger Fabric SDKs also provide REST APIs that can be used by applications to interact with a Hyperledger Fabric network. These APIs provide a more familiar interface for developers who are used to working with web technologies.

5. Hyperledger Explorer: This is a web application that provides a user-friendly interface for interacting with a Hyperledger Fabric network. It allows users to query the ledger, submit transactions, and view network statistics.

6. Hyperledger Composer: This is a set of collaboration tools for building blockchain business networks. It provides a simple way to define, test, and deploy chaincode, and to expose chaincode as REST APIs that can be consumed by web or mobile applications.