Courier services are specialized companies that deliver packages and documents quickly and efficiently. They offer various options, including same-day delivery, next-day delivery, and international shipping. These services are often used by businesses and individuals who need to send important items securely and on time. Couriers typically use a range of transportation methods, such as cars, bikes, and planes, to ensure timely delivery. Many courier services provide tracking features, allowing customers to monitor their shipments in real-time. Popular courier companies include FedEx, UPS, and DHL, each offering unique services tailored to different customer needs.