New Delhi, Oct. 21 -- In bond investments, there are high-credit-quality bonds with single-digit returns and investment-grade bonds with double-digit returns. High-credit-quality bonds are government bonds or AAA-rated corporate bonds. Investment-grade is a technical term; it refers to bonds rated BBB and above. There is a credit rating scale moving from AAA to AA to A to BBB; the definition of investment grade is based on this. For high-credit-quality bonds, you can go through the mutual fund route, or do it yourself (DIY) through online bond platforms. For high-yield investment-grade bonds, there are products from Portfolio Management Services (PMS) and Alternative Investment Funds (AIFs), but for bigger ticket sizes. Or you can DIY thr...