difference between html.hi to evererb &rhtml

hi to everyone whats the difference between html.erb & rhtml

There is essentially no difference. The standard changed in 2.x to
allow the use of one templating engine (e.g., erb, haml, etc) to
create responses for more than one request type.

http://ryandaigle.com/articles/2007/2/21/what-s-new-in-edge-rails-rhtml-and-rxml-to-die-a-slow-and-painful-death