GST goods and services tax - in canada this tax comes in every single thing you buy (food, groceries, haircuts), and each province has a set percentage to be paid. For example in alberta GST is 5% so say you buy something that cost 5 dollars. When you reach the cashier you will pay 5.25 (value + 5%). GST money is used for a large array of things and every item pays the same gst amount according to province tabs.
In Índia GST has the same goods and services tax name, however the idea is a bit different. Products have different amounts to be paid as gst, and they might fall under different categories such as 5/12/18/28% depending on the item.
The money from GST is used to finance lots of things such as health, education etc.