Good communication is an important instrument in social and professional life. Through the formation of communication, human beings realize all their wishes, needs, actions, but also affect people with whom they converse. The primary research topic of this undergraduate thesis is insufficient and poor internal communication in companies and comparison with the company Belupo JSC that has been chosen for this examination. The main objective of the examination is to emphasize and raise awareness of the importance of the role of internal communication within organizations, to familiarize with and apply novelties of internal communication and to consider proposals for improving the quality of communication. The first part of the thesis explains the concepts of business communication, forms and short history of communication, with a special emphasis on internal communication. Then, the profile of Belupo d. d., the satisfaction of their employees at the level of internal communication in the company, and the main shortcomings as well as suggestions for improving communication are illustrated. For the examination in question used are the method of analysis, comparison between the companies Belupo d. d. and Pliva d. o. o. and an interview with an employee of the selected company. A research has been conducted to determine the level of employee satisfaction of the company Belupo d. d. through a level of internal communication within the company and to prove that no business or organizational relationship has such a large and strong role in modern world as the one with employees at all levels.