Property-based Segment

A property-based segment is a group defined by the value of a user or event attribute — country, device, browser, plan or any recorded property.

This is the simplest and most common segment type because it needs no behavior over time, just a recorded value. So it is fast and reliable, but limited: it tells only 'who they are', not 'what they did'. Two property kinds differ here and must not be mixed: a user property that sits on the profile and is durable (country, plan), and an event property attached to a specific action and momentary. Segmenting on a user property makes a stable group; on an event property one must be careful it means 'users who had at least one event with this value'. A common trap is segmenting on a property that can change over time (like plan) without regard to the measurement moment; a user free last year and paid this year falls in which segment depends on the evaluation time and must be made explicit.