BrightnessMakes photo brighter or darker
ContrastEnhances the already bright or darker areas of the photos. Bright areas become even brighter while dark areas become even more darker.
WarmthChanges the the tone of the feature to a more orange (warm) or more blue (cool).
SaturationAdjust the intensity of individual colors. Decreasing saturation will make the colors dull.
HighlightsAdds more focus on the brighter areas of the image
ShadowOpposite of highlights. Puts more focus on darker areas
VignetteAdds dark areas on the corners and edges of the image putting for focus on the center of it.
SharpenMakes the image more clear by lessening the blur
Head on to Hootsuite blog for more details. Images are taken from Hootsuite blog.