Palestine refugees
Palestine refugees are defined as “persons whose normal place of residence was Palestine during the period 1 June 1946 to 15 May 1948, and who lost both home and means of livelihood as a result of the 1948 conflict.”
To find out more information about Palestine refugees visit the official website of The United Nations Relief and Works Agency for Palestine Refugees in the Near East.
https://www.unrwa.org/palestine-refugees
Nakba
Nakba, the term meaning a catastrophe in Arabic, refers to the 1948 Palestinian exodus. In 1948 Palestine war more than 700 000 Palestinian Arabs had to flee or were expelled from their homes. The term “nakba” also refers to the period of war itself and events affecting Palestinians from December 1947 to January 1949.

Palestinians fleeing their homes during the Palestinian exodus (published in www.middleeastmonitor.com/20170515-remembering-the-nakba/)
To discover quick facts about Nakba, the Palestinian exodus, click on the link below.
https://imeu.org/article/quick-facts-the-palestinian-nakba
Population Distribution: Jews and Palestinians, 1946
Source: http://zochrot.org/en