Here is my classification of the "Realtime-ness" levels: - Batch - Interactive (response time low enough for Human to not lose concentration) - Streaming

Here is my classification of the "Realtime-ness" levels: - Batch - Interactive (response time low enough for Human to not lose concentration) - Streaming (as in Streaming Data Ingestion, or Stream Processing, CEP[1], ESP[2]) - can be emulated with micro-batch - Realtime - Near Realtime (response time low enough for Human to not notice, e.g. Chat, Push Notifications, etc.) - Soft Realtime (guaranteed response time for most requests) - Hard Realtime (guaranteed response time for all requests) -- [1] https://en.wikipedia.org/wiki/Complex_event_processing https://en.wikipedia.org/wiki/Complex_event_processing [2] https://en.wikipedia.org/wiki/Event_stream_processing https://en.wikipedia.org/wiki/Event_stream_processing