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Intensity mapping (IM) has emerged as a promising tool to study the high redshift universe and the faint, diffuse extragalactic populations. Without resolving individual galaxies, IM measures the integrated light from all sources and uses that to statistically probe the emission properties of the sources as well as the underlying large-scale structure they trace. In this talk, I will cover several topics on intensity mapping technique. First, I will introduce line intensity mapping (LIM), which probes the 3D large-scale structure of the universe, and a [C II] LIM experiment, TIME, that I am currently working on. Next I will talk about two recent projects on studying extragalactic background light (EBL), the aggregate emission from all extragalactic sources throughout cosmic time. I will present our latest stacking analysis results on probing the extended stellar halo with CIBER, a sounding rocket experiment that measures the near-IR EBL. Finally, I will conclude with future outlook for IM using SPHEREx, an upcoming all-sky near-infrared spectro-imaging survey.