Organization: The Matrix
Smith began as an Agent, an AI program in the Matrix programmed to keep order within the system by terminating human avatars which would bring instability to the simulated reality, as well as any rogue programs that no longer serve a purpose to the Machine collective. To this end, Smith possesses the ability to take control over the simulated body of any human wired into the Matrix. As an Agent, Smith is able to bend the rules of the Matrix (such as gravity and the limitations of the human body), giving him speed and strength beyond ordinary human capability. He and other Agents can dodge bullets flawlessly, punch through concrete with their bare hands, and jump impossible distances.
Agent Smith is significantly more individualistic than the other Agents from the start. While other agents rarely act without consulting each other via their earpieces, to the point where they often finish each others' sentences, Smith is usually the one giving orders or using his earpiece to gather information for his own ends. Smith also appears to be the leader of other Agents in the first movie, as he has the authority to launch Sentinel attacks in the real world. As with other Agents, Smith generally approaches problems through a pragmatic point of view, but if necessary will also act with brute force and apparent rage, especially when provoked by Neo.