Rest-frame spectra of 10 sources observed by JWST/NIRSpec in CEERS. The spectra are normalized to their median flux and offset relative to each other to help the visualization. They are colored in black, red, and green, according to whether they are identified, respectively, as optical+near-IR star-forming, optical+near-IR AGN, or hidden AGN (i.e., optical SF and near-IR AGN), according to the diagnostic diagrams presented in this paper (see Sect. 4.3). The CEERS ID and the spectroscopic redshift of each source are written besides each spectrum. The emission lines that can be identified in the range 0.4 μm < λ < 2 μm are highlighted above the top axis (see also Table 1).