At this moment, one of the fastest growing area of business activities is IT outsourcing. That term is widely knowns between all managers in every prominent organizations. A while ago this became rather obvious, that outsourcing may be one of the key factors to have extremely successful business. Thanks to that, there are many outsourcing companies present on the market those days. The competition is without a doubt high – there are many already existing one, that have rather long tradition already, (for example widely known objectivity ltd), as well as many freshly opened, that are trying to do their best to be successful on the market. As a result of that rough competition, the level of offered services is very high. Nonetheless, it seems to be worth to have a quick insight into reasons why outsourcing firms becoming so famous. Because of that, it may be easier to either decide if it is worth to use such services in a firm.