Bonds with high yields that are also exposed to high risks. The issuers of such securities are often companies with a low rating. Also called junk bonds due to the rating below BBB- (investment grade).Bonds with high yields that are also exposed to high risks. The issuers of such securities are often companies with a low rating. Also called junk bonds due to the rating below BBB- (investment grade).Bonds with high yields that are also exposed to high risks. The issuers of such securities are often companies with a low rating. Also called junk bonds due to the rating below BBB- (investment grade).