Media cost divided by analytics sessions rather than platform clicks. The two differ because of accidental clicks, blocked tags, slow pages, and bots, and the gap between them is a useful measure of traffic quality by placement.
Related terms
Cite this entry:
Agency Echelon. "Cost Per Session." Agency Echelon Reference, reviewed September 2026. https://agencyechelon.com/reference/glossary/cost-per-session/