What is difference between tax and duty?

What is difference between tax and duty?
Tax is a broad term & duty is a part of tax.......Tax levied on person, product, services & assets for example-INCOME TAX levied on person,VAT levied on sale of products,SERVICE TAX levied on providing taxable services, WEALTH TAX levied on assets..........Genrally DUTY levieble on goods for example-EXICE DUTY levieble on manufaturing of goods, CUSTOM DUTY levieble on import & exports of goods...........................Sachin gupta from jhalawar (RAJASTHAN)