impersonation
n. 扮演;模仿;装扮
例句
He did an extremely convincing impersonation of the singer.
他模仿那位歌手维妙维肖。
《牛津词典》
User impersonation is conceptually simple.
用户模拟在概念上很简单。
Answer: What you are describing is something we call "user impersonation".
答:您所描述的情况,我们称之为“用户模拟”。