Session Replay & Heatmaps platforms record visitor sessions on websites and apps, generating playback videos and visual heatmaps (clicks, scrolls, mouse movement, attention) that help marketers and CRO teams understand what users actually do on the page. The category serves CRO/UX research use cases distinct from event-based Web Analytics — instead of aggregate event metrics, session replay shows the individual user experience, surfacing UX bugs, confusion points, drop-off causes, and design opportunities. Core capabilities include full session recording with playback, click and scroll heatmaps, attention heatmaps based on mouse movement, funnel-and-event-triggered session retrieval, error and rage-click detection, A/B-test variant comparison, and AI-powered session-summarization. The market spans free/freemium leaders (Microsoft Clarity, Hotjar), mid-market CRO-flavored (Crazy Egg, Mouseflow, Lucky Orange, Smartlook), and enterprise digital-experience platforms (FullStory, Quantum Metric).