What are Push and Pull Classes in bootstrap?

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The classes are used along with the Bootstrap grid classes of .col-xs-#, .col-sm-#, .col-md-#, and .col-lg-#.
The push class will move columns to the right while the pull class will move columns to the left.
With this simple technique, we are able to rearrange columns without too much fuss. I've seen some developers use hide and show classes to show different grids on small to large devices but these column reordering classes take care of all that for us.

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