Subterranean termites build their nests underground where they build mud tube tunnels to search for food above ground. Termites eat softwoods and cellulose material to survive. If you’re seeing swarms of winged termites it’s a sign the infestation has been active for 3-5 years.
Property preventative maintenance can help reduce possible infestations. Removing rotting wood from the property and eliminating foliage that touches the building structure should be trimmed back.