Can a device function as both a client and a server?

A device can indeed function as both a client and a server because it is capable of performing dual roles in a network. In a typical client-server model, the server provides resources or services, while the client requests those resources. However, many devices, such as computers, can run server software to provide services while also having client software to request services from other servers. For instance, a personal computer can host a web server (acting as a server) while still being able to browse the internet (acting as a client). This flexibility allows for more versatile network setups and resource sharing among devices, enabling efficient communication and data exchange in various networking scenarios.