The history of referendums
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Referendums, direct votes on a specific question put to the entire electorate, developed as a way of involving citizens in decisions considered significant enough to warrant approval beyond the ordinary legislative process, particularly changes to a constitution, which is one reason the subject remains contested, which is why the distinction is rarely trivial.
Their use has varied considerably between countries, with some incorporating referendums as a routine and expected part of constitutional change, while others reserve them for rare and exceptional circumstances or do not use them in this way at all, as a closer look usually confirms, a consideration that seasoned observers rarely dismiss.
Over time, referendums have also expanded well beyond constitutional questions in some places, used to decide a wide range of significant policy issues, reflecting differing views on how much decision making should sit directly with citizens rather than their elected representatives, a subtlety that rewards careful attention.