Can Someone Explain The Difference Between Joinwith And With?

Yii 2.0 General Discussions
1

I’m looking at the yii\db\ActiveQuery API Documentation and it says the following:-

$joinWith - A list of relations that this query should be joined with

$with - A list of relations that this query should be performed with

Can someone please explain the difference between these 2? A detailed example would be great too. :)