Commonly used terms in Commission-SDI are described below:

Adapter SDI component which allows connectivity to external sources.
Commissions Stage Tables Temporary data storage area in Commissions where data from SDI is placed during export. Data is validated in the staging area before transferring into the Commissions tables and executing the pipeline. See Commissions Administrator online help and Data Dictionaries for more details. 
DP Agent
The Data Provisioning Agent hosts all SDI Adapters and acts as the communication interface between Hana and the Adapter. 
Flat File
Flat file allows you to specify data attributes, such as columns and data types table by table, and stores the data in plain text format.
Flow Graph
A graphical user interface to develop data integration mapping and transformations.
EXT Schema
EXT Schema in HANA database is a temporary database that facilitates data validation, transformation, aggregation, and cleaning for large volumes of data. It allows creating custom tables and stored procedures to process bulk data.
HANA Database
SAP HANA database which is used by Commissions for data storage and processing.
Pipeline is a compensation computation process initiated from the Pipeline workspace in the Job Queue view or from the command-line utility. The pipeline produces compensation and pay results for payees assigned to variable compensation plans. See Commissions online help for more details.
Commissions Workspace
Designated area in Commissions where related compensation objects are grouped together so that a user can perform related tasks from the same place.
Protocol for building and consuming REST APIs.
Virtual Table
A HANA component, which allows read and write of data from external sources.
Web IDE 
SAP Web IDE is a browser-based integrated development environment (IDE), comprised of web-based UIs, business logic, and extensive SAP HANA data models, that are leveraged by SDI.
Web IDE facilitates access to HANA database and SDI components. It is also a Web-based development environment for SAP Fiori, SAPUI5, and full-stack business apps.