Process builder allows you to do the below actions:

• Create a new record.
• Update any related record.
• Quick action to create a record, update a record, or log a call.
• Launch a flow.
• Send an email
• Post to Chatter.
• Submit for approval
• Call apex methods
• But the process builder doesn’t support outbound messages.

Workflows can only handle four types of actions:

• Create Task.
• Update Field.
• Email Alert.
• Outbound Message.