This is a contact sheet, it's used to present multiple photos at once to select and refine the best photos 


This contact sheet shows the different white balance settings. White balance changes the colour balance in a photograph - so white objects appear white

If lighting and colour is too warm a cooler filter can be used to balance the white - etc

There is not a lot of white in these photographs to properly demonstrate the use of white balance

making a contact sheet:

open bridge and select your chosen photos

select tools; Photoshop; contact sheet

once Photoshop is opened select the amount of columns and rows