What is coal? Write its uses.

Hint: Coal is a fossil fuel (A fossil fuel is defined as the fuel formed by anaerobic decomposition of buried dead organisms and plants that lived millions of years ago). Fossil fuel releases energy in combustion.Coal is a source of energy.

Complete step by step solution:
As we know coal is a non-renewable source of energy, the colour of coal is black; it is a hard rock which releases energy in combustion. It is mostly carbon but sometimes it also contains oxygen, nitrogen, sulphur and hydrogen. Generally coal is a sedimentary rock formed from peat, by the pressure of rocks laid down later on top.
On the basis of carbon content present coal can be classified into four types namely peat, lignite, bituminous and Anthracite.
Uses of coal: coal has many uses such industry uses, domestic uses,
The most important uses of coal it is primarily used as fuel to generate electric power, it is also used as production of steel, many industries use coal to manufacture certain product, coal is also used for domestic use in cold places or villages it is still used as fuel for cooking and a source of heat in winter and it is also used in train.
Among all the uses the most important uses of coal is generating electricity.

Note:
Among all types of coal anthracite coal is the best coal because it contains high carbon content approximately $ 85\% $ to $ 90\% $ carbon content and peat is the worst coal it contains only $ 30\% $ to $ 40\% $ carbon content that’s why it is difficult to ignite and cannot be easily used for domestic purpose and industrial purpose.