ORC
dataOptimised Row Columnar — a highly efficient columnar storage format for Hadoop workloads that improves performance when reading, writing, and processing data.
Pronunciation
Correct
ork
/ɔːrk/
Pronounced as the word 'orc' (as in the fantasy creature), rhyming with 'fork'. The Apache ORC project documentation confirms this: ORC is both an acronym and a word.
Source: orc.apache.org(official docs)