noun
A person who comes to visit a place, home, or office. Slightly formal; in casual contexts, お客さん or 訪問者 may be more common.
今日は来訪者が多くて、仕事がなかなか進まない。
There are many visitors today, so I can't get much work done.
来訪者用の駐車場はあちらです。
The parking lot for visitors is over there.
お客さん is a casual and friendly term for a guest or customer, while 来訪者 is more formal and impersonal.
Compound of 来訪 (raihō, 'visit') + 者 (sha, 'person'). The kanji 来 means 'come', 訪 means 'visit', and 者 means 'person'.