What is a Spliterator? Diff between Iterator vs Spliterator.

Spliterator (Splitable Iterator) is used for traversing and partitioning sequences.

Key Differences:

1. Parallelism: Iterator is strictly sequential. Spliterator is designed to support parallel processing (used by Streams).
2. Method: Iterator uses next(). Spliterator uses tryAdvance() (combination of hasNext and next).
3. Splitting: Spliterator has trySplit() which partitions a portion of elements into a new Spliterator for parallel threads.