Do Walmart charge for bags?

Could you clarify the policy on bag charges at Walmart? Is it a standard practice for Walmart to impose a fee for bags, or is it dependent on location or other factors? Are there any initiatives in place to promote the use of reusable bags and reduce waste? As a consumer, it's important to be aware of these types of policies when shopping at Walmart, so I'm eager to learn more about their approach to bag charges.