It’s a server side live rendering library where the page is updated live - no large/complex JS required! It’s similar to Drab which has proven very popular in the community.
Here is the forum’s official info thread/wiki: Phoenix LiveView Info
You might also like the discussion in this thread: 54) ElixirConf US 2018 – Closing Keynote – Chris McCord and the Phoenix LiveView blog posts thread.
As well as the #liveview tag.
