The Polish language is the most widely-spoken of the Slavic language subgroup of Lechitic languages which include Kashubian (the only surviving dialect of Pomeranian language) and the extinct Polabian language. The three languages, along with Upper and Lower Sorbian, Czech and Slovak, belong to the West branch of Slavic languages. To English ears, it sounds virtually indistinguishable from Russian, and indeed the two languages have a very similar grammar; however, Polish and Russian speakers cannot understand each other without training due to a very different vocabulary. In other words, to a speaker of one, the other sounds to them about how the first stanza of the poem Jabberwocky would sound to an English-speaker.
