This article provides a comprehensive review of nanoplasmonics, covering fundamental concepts, nanolocalization of optical energy, hot spots, ultrafast nanoplasmonics, control of spatiotemporal nanolocalization of optical fields, and quantum nanoplasmonics (including spaser and gain-assisted plasmonics). It balances theoretical insights with experimental developments, catering to both specialists in the field and a general physics audience. The review highlights key advancements in nanoplasmonics, such as the development of plasmonic nanoantennas, the control of plasmon dynamics, and the application of nanoplasmonics in various fields like sensing, biomedical diagnostics, and label-free detection. The author also discusses the limitations and future directions of the field, emphasizing the need for further research in areas like adiabatic nanoconcentration of optical energy and the extraordinary transmission of light through subwavelength holes.This article provides a comprehensive review of nanoplasmonics, covering fundamental concepts, nanolocalization of optical energy, hot spots, ultrafast nanoplasmonics, control of spatiotemporal nanolocalization of optical fields, and quantum nanoplasmonics (including spaser and gain-assisted plasmonics). It balances theoretical insights with experimental developments, catering to both specialists in the field and a general physics audience. The review highlights key advancements in nanoplasmonics, such as the development of plasmonic nanoantennas, the control of plasmon dynamics, and the application of nanoplasmonics in various fields like sensing, biomedical diagnostics, and label-free detection. The author also discusses the limitations and future directions of the field, emphasizing the need for further research in areas like adiabatic nanoconcentration of optical energy and the extraordinary transmission of light through subwavelength holes.