What are Workflow entry criteria?

Entry criteria are the conditions that must be fulfilled for the workflow actions to execute. 
For example, when a deal's status changes to 'Negotiation', you can automatically schedule a meeting with a contact by creating an event in the CRM.
In this situation:

• The status change is the trigger.
• Status = Negotiation is the condition.
• The creation of an event is the action.

To learn more about workflows, click here.