> What is an "evented parser"?

Also knowns as a “streaming parser”, its a parser that takes in a data stream and produces a stream of events which client code can handle; it allows more flexible handling than deserializers, including ability to handle arbitrarily large input. SAX is a streaming/evented parser API for XML, and there are similar ones for other formats.

The sibling comments are good descriptions, but here are example interfaces:

- Normal parser https://www.javadoc.io/static/com.google.code.gson/gson/2.8....

- Streaming parser https://www.javadoc.io/doc/com.google.code.gson/gson/latest/...

Just a parser which fires events you can listen on when its internal state machine changes state.

Google "event-based parser"