Does Walmart donate unsold food?

I'm curious to know, does Walmart have a policy in place to donate unsold food to those in need? As a major retailer with a significant footprint, I imagine they have a significant amount of food that goes unsold each day. It would be commendable if they were able to find a way to ensure that this food doesn't go to waste and instead helps those who are struggling to put food on the table. So, what's the truth behind this question - does Walmart donate unsold food, and if so, how does their process work?