An event stream or data stream is a key (name) with an associated set of values with timestamps.
Individual events or time-series data points that share a common key (name) are grouped together as an event/data stream within a data bucket. These event/data streams are visualized together as a user specified type such as a line graph, bar graph, row in Waves, etc.
Note: Event Streams are also referred to as Data Streams in some documentation
Note: Event Streams are also referred to as signals in some documentation