Same-day delivery is a service that allows customers to receive their orders on the same day they make a purchase. This is especially popular for items like groceries, electronics, and gifts. Companies like Amazon and Instacart have made it easier for people to get what they need quickly, often within just a few hours. To use same-day delivery, customers typically place their orders online or through an app. After that, a delivery person picks up the items from a local store or warehouse and brings them directly to the customer's doorstep. This convenience saves time and makes shopping more efficient for busy individuals.