This is the 241st most frequent Chinese word.
有人
"Someone" or "there is someone."
'有人' indicates an unknown individual entering unexpectedly.
晚会开始的时候，有人突然走了进来。
When the party started, someone suddenly walked in.
'有人' implies an undefined person with specific information or experience.
听说有人见过那位著名作家。
It is said that someone has seen the famous writer.
'有人' refers to an unspecified individual performing an action.