Why modem is both input and output device

A modem is considered an input And output device because it sends and receives data at the same time. For example, whenever you are surfing, you send a web-page request that its info out, or output. When you receive or access web pages, which would entail an input device.

A modem device serves as both an input and an output device and allows you to connect to other devices on a network or to the Internet.