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Description
Orochimaru's various human experiments took place so as to serve two purposes, most prominent of which was his desire to learn every technique in the world. He was often described as twisted by a large number of people, including Tsunade. Jiraiya speculated that this was due to the fact that both of his parents died when he was at a very young age, and flashbacks shown during his battle with the Third Hokage spoke to this effect
source: [link]

Description
Orochimaru's various human experiments took place so as to serve two purposes, most prominent of which was his desire to learn every technique in the world. He was often described as twisted by a large number of people, including Tsunade. Jiraiya speculated that this was due to the fact that both of his parents died when he was at a very young age, and flashbacks shown during his battle with the Third Hokage spoke to this effect
source: [link]