Hybris: difference between promotion and voucher

Question

I am working on POC on promotions and vouchers. I was going through hybris documentations at most all kind of discounts are covered in promotion Engine.

I also noticed we have coupon promotion too. Having said this, in which case we will chose over vouchers?

It would be great if you can explain me with a example.

Promotion: https://help.hybris.com/1811/hcd/6badeeed32a546689404b9897f8d54ee.html

Voucher: https://help.hybris.com/1811/hcd/8c7fc4e886691014b2ace5fe565624a1.html

Answer 1

Broadly speaking,
Promotions are implicit. The customer has no control over it. If the order qualifies for a promotion then it would definitely be applied.
Vouchers are explicitly applied. The customer is given a voucher number. If and only if the customer enters the voucher number during the checkout process, the voucher will be applied.