What was John Rawls (1921-2002) 'Veil of Ignorance' about?

-He wants you to Imagine we are behind this 'Veil of Ignorance', in that, we have 0 Clue where we will end up in society -We don't know our Gender, Race, Religion, Talents etc etc.. -He argues, that because of the lack of Knowledge, we would usually opt for a much Fairer System, in case we end up at the Bottom -Thus the System should be based on Freedom and Equal Opportunities, where Inequality in Income is not Huge. This should be considered as Correct and Truly Fair