Labor Day (Labor Day in the United States) is an annual holiday to celebrate the achievements of workers. Labor Day has its origins in the labor union movement, specifically the eight-hour day movement, which advocated eight hours for work, eight hours for recreation, and eight hours for rest.
For most countries, "Labor Day" is synonymous with, or linked with, International Workers' Day, which occurs on 1 May. Some countries vary the actual date of their celebrations so that the holiday occurs on a Monday close to 1 May.
Some countries have a holiday at or around this date, but it is not a 'Labor day' celebration.