The Peppol standard for invoices, often referred to as Peppol BIS (Business Interoperability Specifications), defines the technical standards and regulations governing the format and content of electronic invoices within the Peppol network. This standard ensures that invoices transmitted through Peppol adhere to a common format and structure, enabling seamless exchange and processing of invoices among different businesses and countries. It simplifies electronic invoicing processes, making them consistent and interoperable.