Investments have a huge impact and significance on every nation economy. Each country seeks to ensure required amount of investments that would stimulate production growth and growth of employment. This paper presents and explains the term investment and their type and what impact they have on national economy. Theories of investments that offer an overview of investments and their significance on economy are also explained. Apart from the basic division of the investments, foreign direct investments are being mentioned in the paper, which at present have become more and more important for the national economy. National economies are seeking to attract the optimum amount of foreign direct investments to achieve technology transfer and increase of employment. In this paper are also explained motives of recipient countries and the countries where the investments providers are provided and all the benefits they are gaining from taking those moves. The case of the Republic of Croatia is specifically described including the table of gross investments and foreign direct investments. Foreign direct investments are shown through the years by sectors and according to the countries they invested. At the very end of the paper was mentioned a government agency named AIK. The Investment and Competitiveness Agency is designed to successfully increase investment attractiveness and strengthen the national economy.