特务 is a noun that literally means 'special task', but in modern Chinese it is almost always used to refer to a secret agent, spy, or undercover operative — especially in a political or military context. The word carries a strong connotation of covert activity and is often associated with intelligence agencies. Because the common English gloss 'special task/duties' can be misleading (it suggests the job description rather than the person), learners should know that 特务 refers to the agent, not the mission.