A dedicated server is a type of hosting service where an entire physical server is reserved for a single user or organization. This means that all the server's resources, such as CPU, RAM, and storage, are exclusively available to that user, providing better performance and reliability compared to shared hosting. Dedicated servers are often used by businesses that require high levels of security, customization, and control over their hosting environment. They are ideal for websites with heavy traffic, online gaming, or applications that demand significant processing power, ensuring optimal performance and uptime for users.