(Warning - this talk will be purely astrophysical, with no implications for particle physics.) Near-infrared bands offer a window into a high-redshift universe (z>6). Detecting individual galaxies at z>6 is one thing, but we can also detect the diffuse infrared background from unresolved galaxies as well. This gives us a unique opportunity to probe the early star formation history and structure formation at z>6. In this talk, we present the latest theoretical calculations of the cosmic near infrared background, including both the mean intensity and the fluctuations. Then we discuss implications for the ongoing experiments targeting the near infrared background such as CIBER.