A delta-neutral position is constructed so its net delta — its directional sensitivity — is roughly zero (delta explained). It doesn't care whether the underlying goes up or down; instead it profits (or loses) from the other greeks: gamma, theta, and vega (the greeks).

What you're actually trading

With direction neutralized, you're betting on: volatility (a long-gamma delta-neutral position profits from big moves — that's gamma scalping — gamma scalping), time (a short-premium delta-neutral position profits from theta decay — theta), or changes in implied volatility (via vega — implied volatility). You pick which force you want exposure to.

It's neutral for a moment, not forever

The catch: delta-neutral is only neutral at one price and moment. As the underlying moves, gamma changes your delta, so a "neutral" position drifts directional and must be re-hedged to stay neutral (how gamma moves delta). Managing that rebalance is the real work — and the real cost.

Delta-neutral doesn't mean risk-free — it means you swapped directional risk for volatility and time risk. There's no position with no bet.

Who uses it

Market makers run delta-neutral by necessity — they hedge the direction out of every option they trade and profit from the spread and flow (what market makers do). Retail vol traders use it to express a pure view on volatility. It's advanced, requires active management, and isn't a set-and-forget trade (straddles and strangles).