Which of the following devices is designed for user interaction with computer software?

The device designed for user interaction with computer software is the keyboard. Keyboards allow users to input data, commands, and control information in real-time, making them essential for interactive tasks such as typing documents, executing commands, and navigating applications.

While other options like a speaker, scanner, and printer serve important roles, they do not facilitate direct user interaction with software in the same active manner. A speaker outputs sound, a scanner inputs images but is not typically used for real-time interaction, and a printer produces physical copies of digital documents but does not allow for input or interaction. Thus, the keyboard stands out as the primary device enabling users to engage directly and interactively with computer software.