West Slavic languages
The Polish language is a West Slavic language, and thus descends from Proto-Slavic, and more distantly from Proto-Indo-European. More specifically, it is a member of the Lechitic branch of the West Slavic languages, along with other languages spoken in areas within or close to the area of modern Poland, including Kashubian, Silesian, and the extinct Slovincian and Polabian.