Today, with the rise of IoT and Smart Devices, we are generating data at an unprecedented speed. With distributed computing, data is generated somewhere and processed somewhere else. Sensors or UI on devices capture some data (manual or automated) as an event and send it to some other unit for processing. This happens continuously.
These events may be processed at a fixed rate or in bursts, resulting in a stream of events. This process is known as an Event Stream. In most scenarios, these events are generated at a very high speed (seconds or even milliseconds). So, we need to process these event streams at the same or higher processing rate.