We live in an age of information, seen not only as a tool of creation, but also as part of diplomacy, official foreign relations. Increasingly, however, there is an exchange of confidential data in a back-channel manner, not necessarily linked to bodies such as foreign ministries or embassies of countries. So-called back channel diplomacy (BCD – Back Channel Diplomacy), a term that can be translated literally as back channel, side channel diplomacy, refers to a range of activities concerning the exchange of information and the foreign policy making of states, involving players operating in the shadow of the big official raison d’etre. The situation is similar with the activities of ‘Track II Diplomacy’, or Track II diplomacy, whose representatives may be think-tank representatives, academics, influential people with the ability to shape reality and who represent authority.The text is of an illustrative nature; the author would like to present, based on a historical method and literature studies, the issue of unofficial transmission of information through the back channel and the use of 2nd channel diplomacy, together with quoting specific examples. In Poland, these terms are not widely known and used, no less they can be an important element in the study of security issues and international relations