Bootstrap grid for mobile, tablet, desktop -


i'm learning bootstrap , trying understand grid system. i'm getting hang of need clarification on something. understand columns should add 12 in given row, exception of small devices.why column small devices (col-sm-6) included here. bootstrap website. thanks. 

 <div class="row">   <div class="col-xs-12 col-sm-6 col-md-8">.col-xs-12 .col-sm-6 .col-md-8</div>   <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div> </div>


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