Disability is an impairment, but an impairment is not necessarily a disability. The interaction of an impairment with the social barriers that surround you may or may not turn that impairment into a disability. For example; I am a wheelchair user, and If I see a building in front of me with three steps, I cannot get into it. If I cannot get into it, it’s not because I’m on a wheelchair; it’s because the building has 3 steps. If the same building had a ramp, my wheelchair would not be an impairment and I could easily get into the building.