(Free Lossless Audio Codec) format with a high sample rate or bit depth (often denoted by numbers like .2 or 88.2kHz). The word "essay" in this context typically refers to the liner notes biographical essay included in the CD booklet or digital metadata. About The Essential Toto (2004) Release Purpose
The "FLAC" and "88" in your query likely refer to a high-fidelity digital rip (Free Lossless Audio Codec) often shared in enthusiast communities, typically sourced from the remastered 2004 CDs Key Tracks Toto - The Essential Toto -2004- -FLAC- 88