Recently,　both　academia　and　industry　have　initiated　research　projects　directed　on　fog　computing.　Fog　computing　is　not　composed　of　a　powerful　server,　but　by　the　relatively　weak　and　scattered　computers,　processing　appliances,　factories,　cars,　street　lamps　and　other　equipment　data.　In　this　paper,　we　survey　fog　computing　recently　both　in　the　academic　and　industrial　research.　We　introduce　it　and　consider　case　study　that　include　In-vehicle　Network,　NextGen　Manufacturing.Wireless　sensor　network,　and　technical　challenges.　Our　survey　is　based　on　recent　research　publications..