Steel is not a compound or element. Steel is an alloy of iron and carbon and other elements and hence it is a mixture. Because of its high tensile strength and low cost, it is a major component used in buildings, infrastructure, tools, ships, automobiles, machines, appliances, and weapons.
International Workers' Day, also known as Labour Day in some countries, is a celebration of labourers and the working classes that is promoted by the international labour movement, socialists, communists or anarchists.
It occurs every year on May Day which is May 1st. It is the day to pay tribute to the Labourers. Without them nothing will complete.
In India, the first Labour Day, or May Day, was celebrated in 1923 in Chennai.