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343 Guilty Spark is an Artificial Intelligence created by the IsoDidact. Part of him is a fragment of a human named Chakas. He is the monitor, historian, and caretaker of Installation 04, also simply known as Halo. His job was to protect the Halo ring, as well as assist a Reclaimer in the event of a Flood outbreak.
Guilty Spark is first encountered at the end of the level "343 Guilty Spark" in Halo: Combat Evolved, where he finds the Master Chief battling Flood in the bog outside Halo's Library. Believing the Chief to be a "Reclaimer", the Monitor transports him inside the Library.
From this point forward, Guilty Spark remains certain that the Master Chief is a Reclaimer, and so should already know all there is to know about the Flood and Forerunners. He expresses considerable surprise whenever the Chief deviates from the Forerunner's established Flood-control protocol.
It's never actually explained why Guilty Spark believes the Chief to be a Reclaimer. The most popular theory is that humanity is descended from the genetic material of the Forerunners, allowing humans to reclaim lost Forerunner technology. This theory is supported in the novel Contact Harvest where a piece of Forerunner technology "called Luminaries by the Covenant" which detects all Forerunner technology, detects humans as Reclaimers. This is the reason that the prophets of Truth, Regret and Mercy start a war with humanity, as they would not want humans undermining their authority on the Forerunners.
At the end of Halo 3, it is the Master Chief that partially destroys Guilty Spark, after Spark turned on him to try and protect his newly constructed Halo, which the Chief threatened to destroy prematurely.
Between 2553 and 2557, he was interrogated by a human team to learn info on the Didact. He said the humans are "the true reclaimers".