Who are the workers deemed 'essential'?

The federal government has announced new curbs on Tuesday that will close more non-essential businesses, pushing the country closer to the stricter lockdown measures imposed in parts of Europe. But even with such stringent rules in place, many workers will still have to go to work - they are being dubbed “essential workers.” The term has left many Australians wondering what exactly makes an essential worker, and how can we keep them safe during the coronavirus epidemic?