Final answer:
A modem is required for electronic data interchange; it converts digital signals to analog for transmission over communication networks and vice versa.
Step-by-step explanation:
The device required for electronic data interchange is a modem. A modem allows for the digital transmission of data over telephone lines or other forms of communication networks, which is essential for electronic data interchange (EDI).
EDI is a structured way to transmit data between computer systems, typically employed by businesses for e-commerce purposes.
The modem facilitates the exchange by converting outgoing digital signals from a computer into analog signals that can be sent over networks and then converting incoming analog signals back into digital form for the receiving computer.