Abstract: The universe is magnetized. The earth, Sun, Galaxies, Galaxy clusters all host coherent magnetic fields and perhaps even the intergalactic medium in large-scale voids. How do these systems get magnetized? The standard picture involves turbulent dynamo amplification of a weak seed magnetic field. The seed could arise in a cosmic battery and cosmic dynamos then convert kinetic energy of motions to magnetic energy. Another intriguing possibility is magnetogenesis in the early universe, for example during the inflationary era. We discuss the ideas behind both these paradigm for magnetic field origins highlighting current challenges and future prospects.