Artificial intelligence is a large part of Halo lore. Throughout the first three Halo titles, Master Chief is assisted by Cortana, an AI so advanced that it can hack into alien technology, formulate strategies, and even serve as a close personal friend of Chief.
At times, their relationship is so personal that it almost borders on romantic. But as the series went on, Cortana's grip on reality began to loosen.
She had difficulty controlling her emotions and acted erratically and recklessly. This
. Read more on thegamer.com