Question: The first operational computer network in the world was the _________ for the United States Department of Defense

Answer:

The first operational computer network in the world was the ARPANET (Advanced Research Projects Agency Network), which was created in the late 1960s by the United States Department of Defense. The ARPANET was designed to connect computers at different locations so that researchers could share resources and collaborate on projects. It was the predecessor to the modern Internet and was a key development in the history of computer networking.