GST is an indirect tax on the supply of goods and services. This law has replaced many indirect tax laws that previously existed in India. There are following component of GST-
CGST: CGST means Central Goods and Service Tax which is collected by the Central Government on an intra-state sale (Eg: transaction happening within UP)
SGST: SGST means State Goods and Service Tax which is collected by the State Government on an intra-state sale (Eg: transaction happening within UP)
IGST: IGST means Integrated Goods and Service Tax which is collected by the Central Government for inter-state sale (Eg: Delhi to UP )