Professional services are occasional, technological and a unique function performed by any individual, autonomous contractors or consultants who is occupation is representing such services. These services are not limited to licentiates and deal may be run by partnerships, firms, corporations as well as to individuals.

Examples of professional services contracts include:
accountants, archaeologists, architects, brokerage firms, business consultants, copywriters, engineers, law firms, physicians, performing artists, pet groomers, public relations professionals, recruiters, researchers, real estate brokers, translators and web designers.

Selection of an independent contractor or professional providing services is usually based on proficiency, acquaintance, reputation and creativity of the provider. Prices for services vary to large extent with in the same field. Some professional service providers are able to give fixed rates for projects, while others define the price only after assessing the work involved. This is the reason that to hire professionals based upon an hourly fee long with estimated project length is getting more popular.