This article reviews our current understanding about $gamma$-ray detected narrow-line Seyfert 1 ($gamma$-NLSy1) galaxies. The detection with the Large Area Telescope onboard {it Fermi}~Gamma-ray Space Telescope has provided the strongest evidence for the presence of closely aligned relativistic jet in these intriguing active galactic nuclei (AGN) and opened up a realm to explore the physical conditions needed to launch the jet in a different central engine and host galaxy environment than that is known for blazars. Promising results acquired from various multi-wavelength campaigns are converging to a scenario in which the $gamma$-NLSy1 galaxies can be considered as `young blazars. These enigmatic sources hold the key to unravel the jet triggering mechanism and evolution of the AGN phase of a galaxy, in general. As such, $gamma$-NLSy1s should be considered as one of the top priority targets for next generation observational facilities.
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