The answer to this question depends on the type of hybrid we are talking about.
Plant Hybrids
Plant hybrids are often fertile and can reproduce. For example, a mule is a hybrid of a male donkey and a female horse. Mules are typically sterile, meaning they cannot reproduce. However, there are rare cases of female mules giving birth.
Animal Hybrids
Animal hybrids are sometimes fertile and can reproduce. For example, a liger is a hybrid of a male lion and a female tiger. Ligers are typically fertile and can reproduce with other ligers or with lions or tigers.
Human Hybrids
Human hybrids are not possible. Humans are a distinct species, and we cannot reproduce with other species.
In summary, the fertility of a hybrid depends on the specific species involved. Some hybrids are fertile, while others are sterile.