how to use one read and one write sql server

Hello team,

I've heard of a method to use two SQL servers as opposed to one to use the same database.
one server is a read-only server, and the other is s write-only server. the same information needs to be accessible from both boxes and needs to update quickly. does anyone know the proper term for this? and any other information would be greatly appreciated. the method needs to be able to run large reports fairly quickly, and it would be best if it ran on SQL 2014.

Thanks in advance!