 Nanotechnology is the manipulation and use of materials at the nanometer scale, 1 to 100 nanometers, which allows for unique properties and characteristics compared to larger materials. Traditional methods of producing nanoparticles involve physical or chemical processes, but recently, biological synthesis has become increasingly popular due to its environmental friendliness and cost-effectiveness. Biological synthesis involves the use of organisms like bacteria, viruses, fungi, and algae to produce nanoparticles, which can then be applied in various fields including medicine, electronics, and energy storage. This review provides an overview of recent trends in nanoparticle production by biological entities and their potential applications. This article was authored by Monalib and Shah, Derek Fawcett, Shashi Sharma, and others.