An architect is a professional that is trained in designing various types of buildings and spaces including offices, hotels, houses and virtually any other type of residential or commercial building. Architects, like any other professionals, must have completed various training components and be certified or accredited in their area.
Always make sure that the architect that you choose is a proven professional with a good track record of designs in the same type of building that you are considering. Most architects have a specialization, try to choose someone that has training and experience in the design style you wish.