Visitors
Raw arrivals, from search, social, direct links, referrals — and increasingly, AI answer engines that summarize or cite a page and send someone through. This last source deserves its own line rather than being folded into "other" or missed entirely; a visitor who arrives after an assistant has already filtered their intent often behaves differently from one who typed a search query cold.
Traffic on its own answers exactly one question: did anyone show up. It answers nothing about whether showing up meant anything.