This question has not just one answer! Most international authorities agree on 194-195 countries that exist, however, different international organizations differ greatly from the total number.
For example, the 194 countries do not include Kosovo, Palestine, Western Sahara, Taiwan, Greenland and many other partially recognized states.
There are some questions that are more difficult to answer on the total number of countries in the world, as there is no right answer. When we look at official statistics from various governmental and international organizations around the world, there is a big difference to this number.
The model of the 195 countries includes the 193 member countries of the United Nations and two non-member countries: the Holy See (Vatican City) and the Palestine State.