Metallic nanoparticles are being utilized in every phase of science along with engineering including medical fields and are still charming the scientists to explore new dimensions for their respective worth which is generally attributed to their corresponding small sizes. Among several noble metal nanoparticles, silver nanoparticles have attained a special focus. Conventionally silver nanoparticles are synthesized by a chemical method using chemicals as reducing agents which later on become accountable for various biological risks due to their general toxicity; engendering the serious concern to develop environment-friendly processes.To solve the objective, green approaches are coming up to fill the void.For instance, green syntheses using plant sources in the form of extracts exhibiting superiority over chemical and/or biological methods. This book covers the green synthesis of silver nanoparticles by various plant extracts and their environmental remediation applications (photocatalytic degradation of organic pollutants, catalytic and antimicrobial activity).