Wikipedia
An eNotary is a Notary Public who notarizes documents electronically. One of the methods employed by eNotaries is the use of a digital signature and digital notary seal to notarize digital documents and validate with a digital certificate. Electronic notarization is a process whereby a notary affixes an electronic signature and notary seal using a secure Public key to an electronic document (such as a PDF or Word document). Once affixed to the electronic document, the document is rendered tamper evident such that unauthorized attempts to alter the document will be evident to relying parties. The e-notary will use cryptography and Public key infrastructure to create, manage, distribute, use, store, and revoke the digital certificate. The Electronic Notary also must keep an electronic register of each act performed.
In most cases, electronic notarizations does not mean that the notary can perform the electronic notarizations remotely as most states still require that the participants and the notary must all be physically present at the time of signing. There are also significant benefits to having the notarizations done electronically such as cost savings, superior security, authenticity, audit trails, and document integrity, which are things that are not available to paper based notarizations.