Extensible Markup Language (XML)
A markup language and file format for storing, transmitting, and reconstructing arbitrary data. [Wikipedia link]
Extract, transform, load (ETL)
A three-phase process where data is extracted, transformed (cleaned, sanitized, scrubbed) and written (loaded) to a data destination. [Wikipedia link]
Hypertext Transfer Protocol (HTTP)
An application-layer protocol for transmitting hypermedia documents, such as HTML. The foundation of the World Wide Web.[Wikipedia link]