Cellular modules are compact devices that enable communication over cellular networks, such as 2G, 3G, 4G, and 5G. They are commonly used in various applications, including IoT (Internet of Things) devices, smartphones, and automotive systems. These modules contain essential components like antennas, transceivers, and processors to facilitate data transmission and reception. These modules can be integrated into different products to provide connectivity, allowing devices to send and receive information wirelessly. They support various protocols and standards, making them versatile for developers and manufacturers looking to enhance their products with mobile communication capabilities.