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Which language family do Slavic languages belong to?

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Map of Europe showing the geographic distribution of Slavic languages, color-coded by language group: East Slavic (Russian, Ukrainian, Belarusian), West Slavic (Polish, Kashubian, Czech, Slovak, Sorbian), and South Slavic (Bosnian-Croatian-Montenegrin-Serbian, Slovene, Bulgarian, Macedonian). Striped areas indicate regions where bilingualism is common. — Slavic languages Distribution of the Slavic languages in Europe.

The Slavic languages belong to the Indo-European language family. They constitute one of the main branches of this family, which encompasses languages spoken across Europe, areas of European settlement, and parts of South and Southwest Asia.12

Within the Indo-European family, Slavic languages are most closely related to the Baltic group, though they also share certain linguistic innovations with other eastern Indo-European branches, such as Indo-Iranian and Armenian. It is believed that all languages within the Indo-European family originated from a common ancestral language known as Proto-Indo-European.21