difference between over and above

you would use both above and over,When you want to point some object which is up

'Above' and 'below' are usually used when the objects are non touching
here is an example

eg: fan is rotating above our head or we are sitting below the fan

if the objects are touching then we will use 'over'

eg: an apple is over the box or the box is under an apple
eg: we are walking over the bridge