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An affidavit is a sworn written statement. You are swearing that the contents written in the affidavit are true. That document is then signed by a lawyer, a commissioner of oaths, or a notary public.
An affidavit is generally required by OSAP if you need to provide supporting documentation but are unable to provide an official document. For example, an affidavit may be required to support your relationship status (such as a common-law relationship).
You can get an affidavit by booking an appointment at a City of Ottawa Client Service Centre.