Need Basic Clarification

[bond007]

Hi

I'm relatively  new to activiti.  I have some very basic clarification.

1. what is the difference between a task and a model in activiti 6
2. what is a process and model flow.

[jbarrez]

1. A model is what you create in an editor. A task can mean a few things: a step of the process (BPMN meaning of task) or a user task (something a human actor needs to do)
2. Not sure what you mean with this …

[bond007]

Thanks for the response.

One more small clarification. 

What do you mean by sub task and process. Do we have this in activiti 6.

[jbarrez]

sub task = a child of a task.
sub process is a concept from bpmn.

Yes, both are in activiti 6. Everything from v5 is in v6.