Wet/Dry vacuums are large canister-type vacuums that are useful in a garage, or workshop environment. You can use them to pick up large amounts of liquid spills, as well as other types of construction debris. These machines are extremely useful for construction clean up. Things like sawdust and sheetrock dust are no problem for these vacuums. Wet/Dry vacuums can pick up debris that would ruin your regular household vacuum. They can also be helpful if you need to remove a couple of feet of water from your basement.