Thanks for your question. The Australian Electoral Commission (AEC) classifies electorates as safe, fairly safe or marginal. In a safe seat, the winning party receives more than 60 per cent of the vote; it would require a very large swing (change in votes) for the winning candidate to lose this seat at the next election. It is considered a fairly safe seat when the winning party receives between 56-60 per cent of the vote. A seat is classified as marginal when the winning party receives less than 56 per cent of the vote. At the next election, it would take a smaller number of people to switch their votes to another candidate, for that candidate to win.