Queueing models are mathematical representations used to analyze the behavior of waiting lines, or queues. They help in understanding how items or people arrive, wait, and are served in various systems, such as banks, restaurants, or call centers. By studying these models, businesses can optimize their operations and improve customer satisfaction. These models typically include elements like arrival rates, service rates, and the number of servers. Common types of queueing models include M/M/1, which represents a single server with random arrivals and service times, and M/M/c, which involves multiple servers.