Simplify the following text for a Grade 4 native English-speaking person.
Original: In the United States , bathrooms are generally categorized as master bathroom , containing a shower and a tub that is adjoining to a master bedroom , a `` full bathroom '' ( or `` full bath '' ) , containing four plumbing fixtures : bathtub , shower , toilet , and sink ; `` half ( 1\/2 ) bath '' ( or `` powder room '' ) containing just a toilet and sink ; and `` 3\/4 bath '' containing toilet , sink , and shower , although the terms vary from market to market . In some U.S. markets , a toilet , sink , and shower are considered a `` full bath '' .
Simplified: A bathroom is where people can use the toilet , wash their hands , take a bath , or take a shower .