Legalization of a document is a form of certification of a document that allows you to give it legal force for recognition in another state. Legalization is required when a document issued in one state must be submitted to the official bodies or commercial organizations of another state.
Consular legalization of documents is required by organizations of those countries that are not parties to the Hague Convention on Apostille. Legalization confirms the authority, authenticity of the signature and seal of the official who issued the document. The legalization requirement applies only to documents issued by official government bodies. For each country, you need to separately specify the procedure for consular certification of documents.