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, where quick access is important. Companies like Amazon and Instacart have made this service widely available, ensuring that people can get what they need without waiting for days. To use same-day delivery, customers typically place their orders online or through an app. Once the order is confirmed, a delivery person picks up the items and brings them directly to the customer's doorstep, often within a few hours. This convenience saves time and makes shopping easier for everyone.