Goods and Services Tax (GST) registration is a mandatory and legal process through which businesses and individuals in certain countries register with the tax authorities to levy and collect GST on the supply of goods and services. GST registration is typically required for businesses that meet specific turnover or sales thresholds set by the government. Once registered, entities are issued a unique GST registration number, which allows them to charge GST on their sales, claim input tax credits, and comply with GST regulations.