What is the difference between single-send envelope, Powerform and Bulk Send?

The differences between single-send envelope, Powerform and Bulk Send are as below:

 

 

Traditional Single-send Envelope

Powerform

Bulk Send

Contacts

DocuSign User Initiated

Signer Initiated

DocuSign User Initiated

Number of Envelopes Initiated

One

One per click

Many (up to 1,000)

Envelope Uniqueness

Each unique per recipient, template option

Same Template

Same template, unique envelope and data per recipient