Many sales agreements mention asbestos by saying "the buyer is aware asbestos may be used in the construction of this home." This can be a little unsettling. Asbestos is a known carcinogen, and when exposed, tiny particles can be released into the air you breathe.
Asbestos is a common insulator used in many homes, and was used for everything from siding to tape wrapping for furnace air ducts and even sometimes in "popcorn" ceilings. There are several remedies that range from the simple to the complex.
Your home inspector can tell you if asbestos is present in easily visible places such as siding, taping, and insulation, and recommend remedies if necessary.
More information on asbestos can be found right here.