Nanoparticles (NPs) are tiny particles having dimensions ranging from 1 nm to 100 nm. Nanoparticles are field of profound scientific interest, on account of diverse conceivable applications in various fields such as electronic, optical, agriculture, biomedical, etc. Many of the interesting properties of nanoparticles are intimately linked on shape and size of nanomaterials. In nanoparticles, percentage of surface atoms are high; nanoparticles show properties dependent on shape which are utilized in catalysis, optics, data storage, etc. Further, the physical properties of nanoparticles such as melting point, density, optical properties, electrical conductivity, chemical stability, etc. make them suitable candidates to be utilized in several fields. Many of the nanoparticles have been widely studied and many applications explored for example gold and silver nanoparticles, while research is being carried out to investigate the probable applications in several other fields. This review provides the readers a summary of the applications of various nanoparticles.