GST is India's biggest indirect tax reform that unified multiple indirect taxes into a single tax regime. It aims to simplify taxation, reduce cascading taxes, and create a single market. Under GST, taxes are levied at each stage of production and distribution based on the added value. It addresses issues like cascading taxes and lack of input tax credits by allowing businesses to claim credits for taxes paid on inputs. GST also shifts the tax burden to the final point of consumption rather than production. This comprehensive tax system replaces previous indirect taxes and aims to reduce costs and inflation in the long run.