The name of this paper is „Business communication as social interaction“. Without interaction, communication would not be possible. We describe communication as transmitting a message from one person to another. The efficient message has to be clear and unobstructed. Businesswise, communication can be internal and external, and in both cases, we distinguish formal and informal communication. Formal is prepared in advance while informal communication represents a spontaneous exchange of messages between employees. Within organisation the direction of communication is most often from the top (managers) to bottom (employees). Just as in everyday life, the first impression is one of the most important segments as people tend to make their opinions in the first few minutes. Also, in business, you have to respect foreign culture and traditions. When dealing with conflicts it is necessary to react assertively and quickly to minimise consequences because the atmosphere mustn't be full of tensions and distracting. Crisis communication happens when a company is going through severe crisis. Bonton is also very important, because it helps people to develop good manners.