In this thesis, assertive communication is discussed as the right choice in communication and a skill that we need to improve throughout our lives to make it easier for ourselves and others in the communication process. Communication is key to the success of interpersonal relationships, both personal and business. It is a combination of language skills and social interaction. A positive impression in business communication is influenced by friendliness, consistency, accuracy and cleanliness. Effective communication leads to successful teamwork, so relationships between individuals can be critical to achieving goals. It is important to realize that misunderstandings and conflicts are always a part of business communication. However, conflict does not always have to be negative because in some situations it can lead to positive outcomes and create a more effective relationship in the organization. Assertive communication is considered the best solution to avoid misunderstanding or conflict because it is characterized by active listening, the use of "I" messages, respect for others, suggesting solutions, a willingness to apologize when mistakes are made, and control over negative feelings.