For many documents, yes. Certain affidavits, real estate deeds and other documents may not be legally binding unless they are properly notarized. Generally, the Notary will ask to see a current identification document that has a photograph, physical description and a signature. A driver's license, military ID or passport will usually be acceptable. Notaries are not responsible for the accuracy or legality of documents they notarize.
Notaries merely certify the identity of signers.
The signers are responsible for the content of the documents. A standard notarization will require you produce a government issued photo ID such as a valid Driver's License or a Passport. Other forms of identification may be acceptable so long as it has your photo, signature, and is a commonly used means of identification. Please let us know the ID that you have so that we may be prepared for our meeting. Also, if your documentation requires you take an oath, please be prepared to orally state your position concerning the document.