Courier companies are businesses that specialize in the delivery of packages and documents. They offer various services, including same-day delivery, next-day delivery, and international shipping. These companies use different modes of transportation, such as trucks, vans, and airplanes, to ensure timely and efficient delivery. Many courier companies provide tracking services, allowing customers to monitor their shipments in real-time. Some well-known courier companies include FedEx, UPS, and DHL. These companies cater to both individuals and businesses, making it easy to send items quickly and securely across different locations.