Termites are small, white, tan, or black insects depending on their caste that can cause destruction to wooden structures. I always suggest a termite inspection if you are purchasing a home or at least an inspection every few years just to be safe.
After determining the infestation a treatment is necessary to keep them out, this is done by generally placing a termiticide into the soil next to or under the foundation. This is better done by a termite professional because it involves drilling and placing the termiticide under slabs of concrete. I often see termite tubes in garages and specifically in the area of the expansion joint (as noted by the first picture).
Call ProBest Pest Management for a inspection today and prevent damage or further damage. 480-831-9328 or 623-414-0176