There are so many values of the Display css property. YOu can find the reference here:
http://www.w3schools.com/cssref/pr_class_display.asp[
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However, here are a couple of tips from my side which you may find helpful:
Display = none will hide your div, rest values will show the div.
If you need the div for layouts then use Display = block.
If you need to give your div fixed height and width then use Display = block