SAP File Lifecycle Management - What is the difference between Share and Send in Parallel

We are new in implementing SAP File Lifecycle Management (FLM) and are confused with different mode of Workflow , Sending and Sharing options. My specific question is what are the differences and different scenarios in which the actions are attributable:

1. Send
2. Send in Parallel
3. Share
4. Send Back
5. Send to Initiator