Online fax services allow users to send and receive faxes over the internet without the need for a traditional fax machine. These services typically require an email address or a web-based platform, making it easy to send documents as attachments. Users can also receive faxes directly in their email inbox, streamlining the process and reducing paper waste. Many online fax services offer features like secure encryption, digital signatures, and cloud storage integration. Popular providers include eFax, MyFax, and Fax.Plus. These services are especially useful for businesses and individuals who need to send important documents quickly and efficiently.