What does a voice recognition system primarily replace in terms of user input?

A voice recognition system primarily replaces the keyboard and input device by allowing users to input data and command a computer or device through spoken language instead of traditional typing. This technology enables hands-free operation, making it particularly useful for individuals with disabilities that may hinder their ability to use a keyboard or mouse effectively.

By recognizing spoken commands, the system translates voice signals into text or actions, streamlining user interaction and enhancing accessibility. The other options involve different kinds of input mechanisms but do not encapsulate the primary function of voice recognition, which focuses specifically on replacing text entry and manual command input typically associated with keyboards. This enhances user convenience and supports various applications, from personal computing to assistive technologies.