Final answer:
English is the principal language of global communication, surpassing other languages like Esperanto, due in part to the historical and current global influence of English-speaking nations.
Step-by-step explanation:
The principal language of communication and interaction for the entire world is English. Despite interesting proposals like Esperanto, a planned language which was formed using words from Latin, Germanic, and Slavic language groups, it didn't gather much support for universal adoption. English, on the other hand, has become the international language of commerce, travel, entertainment, and politics due to the historical influence of the British Empire and the current global impact of the United States. Although there are thousands of languages spoken around the world, English's predominance is clear across continents and in various domains of international interaction.