You are mistaken.
Holocaust is a word meaning "Great destruction resulting in the extensive loss of life, especially by fire." It is usually reserved for situations such as the effects of a man-made disaster (e.g. "Nuclear Holocaust"). When used to refer to genocide, the word is rarely used except to describe the deaths of Jews and other victims of Nazi Germany during World War 2.
Although the true figure may never be known, here are estimates:
11 million people died.
6 million were Jewish (close to two thirds of Europe's Jewish population).
1.5 million were children.
In addition to Jews, Hitler targeted homosexuals, communists and other political dissidents, gypsies, slavs, Jehovah's witnesses, Protestant and Catholic priests, blacks, the mentally and physically disabled, and others.
There are approximately 250 Holocaust museums and centres around the world where you can learn more, as well as extensive information elsewhere on the Internet.
The Holocaust was systematically conducted in most areas of Nazi-occupied territory. Many were killed in specific death camps between 1942 and 1945, usually by being poisoned in gas chambers. The largest death camp was Auschwitz-Birkenau in Poland, responsible for the deaths of an estimated 1.6 million Jews. Prior to the death camps, killings were mainly by shootings. The Holocaust, authorised by Hitler himself, is believed to have been centrally planned by senior Nazi officials at the Wannsee conference held near Berlin on January 20 1942.