Could the Holocaust ever happen again? For some people this terrible event is distant history, but many Jewish communities worry that the danger remains.
By 1945, six million Jews were dead
Nazi atrocity: A group of orphaned children stand behind a barbed-wire fence inside a concentration camp in German-occupied Russia, circa 1942. Glossary
Nazis - A German political party of the twentieth century, led by Adolf Hitler. The Nazis controlled Germany from the early 1930s until the end of World War II.
Holocaust - The murder of six million Jewish people in Europe by Nazi Germany. Members of other minority groups were also killed.
Roma - A travelling community who are thought to have originated in India.
Sinti - A Central European community who used to be travellers but are now mainly settled.
Persecution - Ill treatment and oppression, especially due to a person's beliefs or race, gender, religion, sexual orientation or other factors.
Antisemitic - Hostile to or prejudiced against Jewish people.
Hanukkah - Also called Chanukah, an eight-day Jewish festival known as the "festival of lights" which usually takes place in December. It is a reminder of a battle against the Greeks over religious freedom more than 2,000 years ago.