The process of globalisation in the contemporary world strives to unite people in application of knowledge, technology and encourage further research in order to ensure progress of the mankind. The globalisation process has made a strong impact on the use of the English language in most parts of the world, consequently, currently around ¼ the global population speaks English (WEF, 2020), using it in international business, politics, modern technology and media, world economy and everyday communication. For this reason, it has become a global language (lingua franca). Nowadays, the English language is a key factor in global communication (Lončar, 2005). The USA economy being the strongest economic power worldwide, and with the expansion of the American market all over the world, acquisition of the English language has become a necessary skill in conducting all kinds of business activities. English proficiency facilitates communication between companies and foreign partners providing easier co-operation, interaction and problem solving between companies. The aim of the thesis is to show what forms of written communication are used in the business environment in English as a powerful tool of modern business, which, in addition to keeping track of technological trends, helps in achieving various business goals.