Tax is the most important source of income or revenue for the government.
Tax is a liability of a person or an organization to the state or government.
Direct tax is a tax which is collected directly from the individuals and organizations on the basis of their incomes and properties.
Indirect tax is a tax which is imposed upon one person but paid partially or wholly by another person. It is levied for the production, distribution and consumption of goods and services.
The tax which is collected by the government at the boundary of the country at a time of importing and exporting the goods is known as custom duty.