In soil, termites will forage for cellulose material found in plants. Typically you can unearth termites in the mulch surrounding your home or in a nearby wood pile. When soil conditions and temperatures are ,good for termite activity, colonies can develop near the foundation of your home. As termites forage for food in the soil, they often enter homes through small cracks (1/16 inch wide or less).
once inside they will continue for forage for food and inside the home, the food will typically be wood. This wood can be any structural timber around the foundation, behind walls, in ceilings and in many areas that may go unnoticed for months or years.