Enterprise Asset Management - the business processes previously called 'Plant Maintenance' by SAP.

Enterprise Portfolio and Project Management, a module of SAP S/4HANA

Electronic Invoicing - method of communicating with government authorities in relation to sales and procurement invoices, such as registering invoices with the government authority, or validating that a given invoice is valid. 

Enterprise Resource Planning - a type of IT system used to execute core business transactions in functions such as Finance, Supply Chain, Manufacturing, Warehousing, etc. SAP S/4HANA is a type of ERP system. 

Extract, Transform, Load; an approach for moving data from one system to another, potentially with some transformation or cleansing inside the process. Specialist tools are available to support such a process, but they are not required. 

Electronic Document Interchange - a generic term for the exchange of business documents such as orders, invoices, good receipts, etc. between companies participating in a transaction. May be facilitated by an interposed network or agency which handles routing, validation, etc.