An apostille is a form of international document authentication that verifies the authenticity of a signature, official seal, and the authority of the person who signed the document. It confirms that a competent authority issued the document and that countries party to the Hague Convention of October 5, 1961, recognize it.
Poland and the United States are signatories to this convention, meaning that public documents bearing an apostille can be legally used for transactions between these countries without requiring additional legalization. Polish institutions will recognize documents with this certification as valid and authentic.