A Star-Forming Region (SF Region, Stellar Nursery, SFR) is a region in space where Star Formation is taking place, or could happen. The presence of Protostars is a clear sign, as well as a dense Molecular Cloud, perhaps with Dust.
Note: the abbreviation "SFR" is also used for Star Formation Rate.
Herschel Orion Protostar Survey (HOPS)
Herbig-Haro Object (HH)
Infrared Dark Cloud (IRDC)
Infrared Space Observatory (ISO)
Lyman-Break Galaxy (LBG)
Large Magellanic Cloud (LMC)
Orion Nebula (M42)
Rho Ophiuchi Cloud Complex
Star Formation History (SFH)
Star Formation Rate (SFR)
Star Formation (SF)
Taurus Molecular Cloud 1 (TMC-1)
Young Stellar Object (YSO)