Last mile delivery refers to the very last step of the delivery process when a parcel is moved from a transportation hub to its final destination—which, usually, is a personal residence or retail store. This is the most critical step in the delivery process, and the one that businesses want to ensure is as quick and efficient as possible. This is to keep up with the continually increasing consumer demand for speedy shipping, especially in e-commerce, food, and retail industries. It also happens to be the most expensive leg of the journey that goods take to reach their ultimate destination.