What are bio-pesticides? Why they are considered better than synthetic pesticides?

Explanation

Pest like aphids, spider and mites can cause serious damage to flowers, fruits, and vegetables.
These creatures attack the garden in swarms, and drain the life of the crop and often invite disease in the process. Many chemical pesticides prove unsafe for human and the environment. It turns fruits and vegetables unsafe for consumption. Thankfully, there are many homemade, organic options to turn to war against pests.