Elixir combines aspects of Erlang, Clojure and Ruby to provide immutable data structures, high-order functions, pattern matching, and concurrency features like lightweight processes and message passing. The document discusses Elixir concepts like immutability, collections, functions, composition, concurrency and tooling like IEx, Mix, ExUnit and Dialyzer. It also covers Erlang concepts like ETS, Erlang Top and built-in term storage that Elixir inherits from Erlang.