What is defined by borders, a distinct language, customs, and a structure. If we said a country we would be correct. However, it also applies to groups of people with a common purpose.
Our workplace for example is like a country. So is the gaming community, social groups, interest groups, scientific community, students, and so on. They all have their own language, customs, and structure.
With globalization; increasingly, our groups will span borders and continents and like traveling abroad we will get a temporary entry visa when we join a new group which we can lose if we don't adopt the culture and language of the group.
The willingness to learn new cultures, languages and customs is and will be key to making our way both in business and personally in the future. We will have to have greater flexibility to deal with new groups with the rate of change the future will bring.