Organic traffic is the visitors who reach your website by clicking an unpaid listing in the search results. When someone searches "best breakfast in Portland Maine," clicks a regular (non-ad) result, and lands on a cafe's site, that visit is organic traffic.
The word "organic" is the key contrast. Paid traffic comes from ads you pay for click by click. Organic traffic comes from earning your spot in the natural results through SEO. You are not charged when someone clicks an organic listing — you earned that placement through relevance, quality, and authority.
