This chapter briefly covers the basics and definitions of knowledge and knowledge management, the connection between KM and communication, its Hungarian and international development and tendencies in the past years and the so called KM generations. The chapter's goal is to show how and why the support and appreciation of knowledge (which almost exists since the beginning of humankind) developed into a system. Successful management of companies using KM systems bring to the surface a new breed of organization operating models operating with intelligent solutions, which are manifold, may be structured in a variable way, and are specifically unique in the light of these knowledge-intensive services.