What is the use of role when registering user in Hyperledger Fabric

Question

fabric_ca_client.register({enrollmentID: 'user', affiliation: 'org1',role: 'client'}, admin_user)

Answer 1

When you register a user, that user becomes a node in the network. A node can be one of the following three:

1. Client
2. Peer
3. Orderer

role:client is used to specify the type of node the user is. 

A client is a node that submits transactions-invocation.