Looking to hire a notary in Indiana? Learn what to expect, what documents can be notarized, mobile notary options, and legal requirements in this quick guide. Everything you need to know when hiring a notary public What Is a Notary Public and Why Do You Need One? A notary public is a licensed official authorized by the state to witness the signing of legal documents, administer oaths, and help deter fraud. Their seal confirms that the signer’s identity was verified and that t