Well Sales tax in India is of 2 types
1. Within State called VAT
2.Outside State called Central Sales Tax or CST
For more details,you can refer
http://www.teachoo.com/67/29/What-is-Input-Vat-and-Output-Vat/VAT-CST-BASICS/author/teachoo/
http://www.teachoo.com/68/29/What-is-CST-Payable/VAT-CST-BASICS/author/teachoo/