Attestation is a simple term used on the occasion of document attestation. Well, it is needed in many scenarios legal procedures, immigration or long term travel etc.
The process of attestation begins from legalizing a document from its issuing authority and higher authorities, it may depend upon the category of documents. As there are three types of documents issued and might need attestation, if you are planning to relocate/migrate to a foreign country.
Attestation is a complicated process which demands legal expertise in handling documents such as personal, commercial and educational.