Instacart is a nifty website and app that allows you to order your groceries from your favorite stores.
While there are other online grocery shopping providers out there, Instacart's unique selling point is that it only requires customers to wait for about an hour to get their groceries delivered. Instacart's on-demand orders are instantly scheduled. The orders are then delivered by crowdsourced labor from a variety of stores which differ in their hours and inventory.
Instacart uses machine learning to map out individual stores and predict delivery times. Different variables such as the weather, traffic patterns, location and even factors such as large public events are taken into account when estimating the delivery time.
The end result is that, over a period of time, customers are saved a lot of time and effort.