In business, communication plays a very important role. Communication is considered the most important skill for a person to be successful in his career. At the same time, with the explosion of the globalization process, the word "international" began to be used more and more, such as "international communication". Globalization has various aspects that affect the world in many different ways. One of these ways is the international language spoken in the world. The most popular language is English and is used for communication between people of different nations who do not share a common native language. This language is associated with the domain – commercial, economic, cultural and political – that made it popular. The purpose of this project is to introduce to all of you who are interested what an international language is and why we are used and also why English is the most important international language in the world. Below you can find some statistics on the most widespread language in the world, on the countries where English is the official language. You can also read some information about the history of English and when and why English started to be an international language, used for many countries as an official language and learned for many countries as a second language. First of all I will present you some reasons why where an international language is needed. In general my readers become or are partners in international communication with their foreign counterparts, performing not only professional functions but various social functions, which require from them a good knowledge of an international language (or a common language), and also the mastery of business communication skills, such as: oral comprehension of the business sector, speaking on professional topics, dealing with visitors, using the telephone, verbally conveying business information, reading and writing various business correspondence, reports, etc. It should also be added that nowadays foreign and domestic companies as well as government institutions are interested in hiring young specialists with good knowledge of an international language. They need to speak a common language not only because of their export trade but also for other reasons, including: the trend towards multinational corporate structures, the increase in foreign business travel, foreign visitors and participation at international trade fairs, conferences and seminars, growing bureaucracy in foreign markets. Linguists estimate that there are approximately 5,000-6,000 different languages ​​spoken in the world today.