What "market neutral" means
A directional strategy makes money when the market moves the right way. A market neutral strategy aims to be largely indifferent to that direction, seeking instead to profit from the relative performance of one thing against another — for example, one asset outperforming a related one, or a price relationship reverting to normal.
By pairing positions so that broad market exposure is substantially reduced or hedged, the strategy aims to isolate a specific source of return from the market's overall ups and downs. The goal is a return stream driven by relative value and skill rather than by market direction.