Funnels specify steps to match actor journeys against any expected event flow and calculate statistics on how many actors completed each step. Funnels break down actor journeys into sub-series of events. Unlike sessions, they are defined by matching steps (specific events) rather than timeout. Funnels can also be used to find paths to, from, and between particular steps.
In Scuba, funnels and sessions are folded into flows, with additional functionality.