GST replaced a tangle of older taxes like VAT, service tax and excise with one unified system. It applies at rates such as 5%, 12%, 18% and 28% depending on the product or service.
Although businesses collect and remit GST, the cost is passed along until the final customer bears it. Businesses claim credit for GST they paid on inputs, so tax is effectively charged only on the value they add.
For example, on a ₹1,000 service taxed at 18%, you pay ₹1,180 — ₹180 of which is GST. Registered businesses charge, collect and file this with the government, offsetting the GST on their own purchases.