Swedish, or Svenska, is spoken by 10 million people. The large majority of them live in Sweden, with the rest living in Finland, Norway, and Estonia. Swedish is the official language of Sweden and one of the official languages of Finland, along with Finnish. It is a Germanic language like Icelandic, Norwegian, and Danish. The Swedish, Danish, and Norwegian languages all came from Old Norse about 1000 years ago, with some Low German thrown in.
Swedish vocabulary is mostly Germanic, with words like "gas" for goose and "kung" for king. As in German, new Swedish words are formed by putting words together, so it is very flexible. New verbs can be created by simply adding an "a" to an existing verb, like adding an "a" to disk (dish) and it becomes "diska," which means doing the dishes.