điệp viên
/spaɪz//spaɪz/The word "spies" originates from the Old English word "spiorhan," meaning "to monitor, investigate, or inquire." This word was derived from the Old Norse "spjōra," which metaphorically translates to "to pick or pluck" because spies were traditionally assigned to "pick" or "pluck" information from their targets. The term's origin can be traced back to the early medieval period when kings and lords employed individuals to gather intelligence on potential threats, such as rivalating neighboring lords or invading armies. These people were termed "spies" in Old English, and their duties ranged from espionage to reconnaissance, such as gathering information about territories and potential enemies' strengths and weaknesses. In modern times, the word "spies" typically refers to intelligence agents employed by governments to acquire confidential information about foreign powers, terrorist organizations, or other potentially hazardous entities. The role and function of spies have evolved over time, but their designation as "spies" has remained steadfast since the Old English period.