SAP Application specific database tables
Here is number of popular SAP tables by Area including the Technical Name and Description
Purchasing
EKKO - PO Header
EKPO - PO Item
EBAN - Purchase requisition
EKBE - History per Purchase doc.
EKKN - Account Assignment in Purchasing Document
EBKN - Purchase Requisition Account Assignment
Order data (Network) - IW32
AUFK - Order master data
AFKO - Order header data
AFPO - Order item data
AFVC - Operation within an order
AFVV - quantities/dates/values in the operation
EKKN - Find purchase document(EBELN,EBLP) linked to order(AUFNR)
EBKN - Purchase Requisition Account Assignment
Accounting
BKPF - Accounting Document Header
BSEG - Accounting Document Segment
CSKS - Cost Center Master Data
PRPS - WBS master data
AUFK - Order master data
CEPC - Profit Center master data
RBSELBEST - PO associated with aparked invoice
Line items (Rep: RPUDRIG0)
COVP - CO Object: Line Items (See FM HRGPBS_DRILL_READ_COVP)
COOI - Commitments Management: Line Items
PPDHD - Transfer to Accounting: Document Header
PPDIT - Transfer to Accounting: Lines in HR IDOCs
(See FM HRGPBS_DRILL_SELECT_POST_LINE)
Invoice data
EKKO - PO Header
RSEG - Incoming invoice (Invoice doc, PO doc)
RBKP - Invoice receipt
Project plan/WBS
PROJ - Project data
PRPS - WBS
PRHI - WBS breakdown within project
Sales
VBAK - Header
VBAP - Item
VBPA - Sales Document Partner
Shipment
VTTK - Shipment Header
VTTP - Shipment Item
Delivery
LIKP - Delivery Header
LIPS - Delivery item
Vendor
LFA1 - Vendor Master
LFB1 - Vendor Master (Company Code)
Customer
KNA1 - Customer Master
KNB1 - Customer Master (Company Code)
Material
MARA - Material data
MARC - Material Plant Details
HR
PNP - Get Pernr (Personnel data)
PCH - Get Objec
TEM
TEM table structure