Fulcra organizes your data into two main pieces.
Data types describe the things you can record: heart rate, step count, calendar events, and so on. Fulcra provides a catalog of built-in data types, and you can create your own.
Records are the entries themselves. Each record is either an event (a point or a span of time) or a metric (a value over time). Every record carries information about where it came from, and records can be tagged.
Full details are in the developer documentation: https://docs.fulcradynamics.com/fulcra-platform/#concepts