International Cooperation is aid provided for the social and economic progress of developing nations, through the transfer of technology, knowledge, abilities or experiences by multilateral organizations or other countries In other words, it is a form of joint action for supporting economic and social development through said transfers of technology, knowledge, experiences or resources carried out by countries with a similar or greater degree of development, multilateral bodies, non-governmental and civil society organizations. It is also known as Development Assistance and it is a global concept that consists of different types of aid grants that flow towards countries with a lesser degree of relative development. 
This definition contains information taken from the following sources (in Spanish):
 APC-COLOMBIA. Definiciones.