The main language spoken in Sweden is "Swedish." It is a North Germanic language closely related to Danish and Norwegian. Swedish is the official language of Sweden, and approximately 10 million people speak it worldwide. The language has its roots in Old Norse and has evolved significantly over the centuries. Swedish is characterized by a relatively simple grammar structure and a rich vocabulary derived from various influences, including Latin, French, and German. It's also worth noting that many Swedes are multilingual, often speaking English and other languages fluently.