Afghanistan Document Legalization is necessary if you want to use and recognize a specific document for use in Afghanistan. Legalization is a form of authentication that requires certain steps and procedures in order to be able to use your document abroad in participating countries outside the Hague Convention.
To give you more information. There are two types of authentication: apostille and legalization.
Legalization countries are those that have not accepted or recognized the apostille seal as a uniform form of authentication. These countries are called non-participating countries of The Hague.

You can obtain Afghanistan embassy legalization through a lengthy process of authenticating your document, whether it is a personal document or a corporate document. The process is almost the same, with minor changes depending on the type of document and the state in which the document was issued.
Afghanistan is a very special case, as the Afghan embassy in Washington DC may require additional procedures that are normally required. So keep in mind that you may be exposed to additional processes when you authenticate a document for use in Afghanistan.