1) Contrast is the difference between lights and darks in an image. Increasing contrast makes lights lighter and darks darker.
2) Saturation is the amount of color. Increasing saturation enhances colors and makes them more vibrant, while decreasing saturation removes color.
3) Low fi cameras originally produced cheaply in China have visual characteristics like vignetting, light leaks, chromatic aberration, high saturation, and high contrast that were limitations but are now seen positively.