How does a referendum work, and is it binding?
A vote by the electorate on a single question — and whether it binds anyone depends entirely on the law that created it, which is where most public confusion originates.
Binding versus advisory. In some systems, referendums are constitutionally binding: a result automatically changes the law or the constitution, sometimes requiring additional thresholds such as a majority of regions as well as of voters. In others — including the United Kingdom, where Parliament is sovereign — a referendum is legally advisory unless the enabling legislation says otherwise, and implementation requires Parliament to legislate.
Advisory is not the same as inconsequential. A government that ignored a referendum result would face severe political consequences, which is why the legal position and the practical position diverge.
What the enabling legislation must settle, and where design choices matter enormously:
The question, which is usually tested by an electoral commission for clarity and neutrality — wording measurably affects results, and leading questions have been rejected.
The franchise. Who votes, which can differ from a general election.
Thresholds. Whether a simple majority suffices, or whether a supermajority or minimum turnout is required. A turnout threshold creates a perverse incentive to abstain, since not voting counts as opposition, which is why some systems avoid them.
Campaign regulation — spending limits, designated lead campaigns, and rules on official information.
What happens afterwards, including whether the result is implemented automatically.
The recurring criticisms: a binary choice on a complex issue with many possible implementations; the result specifying a direction and not a form; vulnerability to misinformation and to campaign spending; and no mechanism for revisiting a result, which entrenches an outcome reached under one set of circumstances.
The defence: on genuinely constitutional questions, direct consent carries legitimacy that a parliamentary vote does not.
Some countries use them routinely with well-developed procedural safeguards, which is a different practice from occasional high-stakes referendums held without an established framework.
General information; arrangements vary substantially by country.