PostHog Session Recording is a client-side JavaScript library that observes and records user interactions on a website. This includes capturing mouse movements, clicks, scrolls, form inputs, and DOM changes. The collected data is then transmitted to the PostHog backend, enabling website administrators to visually replay user sessions exactly as they occurred. This functionality is invaluable for product teams, UX designers, and developers who need to understand how users navigate their site, identify areas of confusion or friction, and diagnose bugs by seeing the user's exact steps leading to an issue. The script typically captures enough information to reconstruct the visual state of the page during the session without necessarily recording sensitive personal data in raw form, often redacting or masking it.