Aboriginal Australian identity, sometimes known as Aboriginality, is the perception of oneself as Aboriginal Australian, or the recognition by others of that identity. This is often related to the existence of (or the belief of the existence of) ancestors within one's family lines which were directly descended from individuals who lived in the continent of what is now known as "Australia" at a time before the British-led mass immigration programme that occurred post-1788. People can be classified as Aboriginal no matter how minor a part of their family tree is Aboriginal - i.e. an individual can have a vast majority of their ancestry as non-Aboriginal, but still be classified under 21st century definitions as Aboriginal.