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We present our very recent results on the sub-mJy radio source populations at1.4 GHz based on the Extended Chandra Deep Field South VLA survey, whichreaches ~ 30 {\mu}Jy, with details on their number counts, evolution, andluminosity functions. The sub-mJy radio sky turns out to be a complex mix ofstar-forming galaxies and radio-quiet AGN evolving at a similar, strong rateand declining radio-loud AGN. While the well-known flattening of the radionumber counts below 1 mJy is mostly due to star-forming galaxies, these sourcesand AGN make up an approximately equal fraction of the sub-mJy sky. Our resultsshed also light on a fifty-year-old issue, namely radio emission fromradio-quiet AGN, and suggest that it is closely related to star formation, atleast at z ~ 1.5 - 2. The implications of our findings for future, deeper radiosurveys, including those with the Square Kilometre Array, are also discussed.One of the main messages, especially to non-radio astronomers, is that radiosurveys are reaching such faint limits that, while previously they were mainlyuseful for radio quasars and radio galaxies, they are now detecting mostlystar-forming galaxies and radio-quiet AGN, i.e., the bulk of the extragalacticsources studied in the infrared, optical, and X-ray bands.

The AGN content of deep radio surveys and radio emission in radio-quiet AGN. Why every astronomer should care about deep radio fields