A loan against Sovereign Gold Bonds (SGBs) is a facility provided by banks and financial institutions where individuals can use their SGB holdings as collateral to secure a loan. Sovereign Gold Bonds are issued by the Government of India, and they offer a way for individuals to invest in gold without having to physically own it. These bonds are denominated in grams of gold, and their value is linked to the prevailing market price of gold. 

Before opting for a loan against Sovereign Gold Bonds, it's essential to carefully consider the terms and conditions, including the interest rate, repayment schedule, and consequences of default. Additionally, compare offers from different lenders to ensure you're getting the best deal.