title: Explanation of JSONB introduced by PostgreSQL
body: <p>PostgreSQL just introduced <a href="http://www.depesz.com/2014/03/25/waiting-for-9-4-introduce-jsonb-a-structured-format-for-storing-json/" rel="nofollow noreferrer">JSONB</a> in version 9.4, and it's already trending <a href="https://news.ycombinator.com/item?id=7457197" rel="nofollow noreferrer">on hacker news</a>. How is it different from Hstore and JSON previously present in PostgreSQL?</p>
  <p>What are its advantages and limitations and when should someone consider using it?</p>