The early use for computers (apart from classified wartime codebreaking) was handling business information storage and retrieval. Previously large amounts of information were stored on card indexes which required large archives and teams to retrieve relevant cards in response to queries.
So this function was replaced by new technology for processing information – *Information Technology*. That department then diversified as computers changed, into what we see today. IT departments are still heavily engaged in ensuring secure data (information) storage, backups etc.
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