One of the most common reasons is for the notarization of important legal documents such as wills, trusts, and powers of attorney. These documents often require notarization to ensure that they are legally binding and will be recognized in court.
Another reason someone may need a notary is for the signing of real estate documents such as deeds, mortgages, and lease agreements. These documents often require notarization in order to be recorded with the county or state.
Notarization may also be required for the signing of business documents such as contracts, agreements, and partnership papers. Notarization ensures that all parties involved understand the terms of the agreement and that they are entering into the agreement willingly and knowingly.
Finally, some government agencies require the notarization of documents such as passport applications, immigration papers, and vehicle titles.
In short, a notary is necessary for any legal document that requires verification of the identity of the signer and the authenticity of the signature.