The Exposure Tool Tab provides controls to adjust exposure aspects of images. Basic controls (e.g. Exposure Compensation) affect the whole image, while advanced controls (e.g., High Dynamic Range) enable users to fine-tune adjustments.
Levels and Curves can adjust the overall lightness values as well as the individual Red, Green, and Blue color channels. The Clarity tool can help reduce haze or (a negative value) create a softening effect that is particularly effective when applied to a portrait image to smooth out skin tones.
Note that the Layers tool near the top allows you to make localized adjustments with masks. This tool is also available in some other Tabs.