Leverage is controlling a larger position than your own cash would allow, so that a given price move produces a bigger percentage change in your account. It is the double-edged sword at the center of most trading blowups - and most trading fortunes.
The double edge
Leverage magnifies everything, symmetrically. Use 5x leverage and a 2% move in your favor becomes a 10% gain - but a 2% move against you becomes a 10% loss. It does not improve your odds or your edge; it only scales the outcome. Traders fixate on the upside and forget that leverage shortens the distance between a bad day and a blown account.
How options embed leverage
Options are inherently leveraged: a small premium controls exposure to a much larger amount of stock. A modest move in the underlying can multiply the option's value - or send it to zero. That built-in leverage is why delta and position size matter so much, and why 0DTE options are the most leveraged, unforgiving corner of the market.
Leverage does not create an edge. It just turns the edge - or the mistake - you already had into a bigger number.
Respecting it
The professionals who use leverage survive because they respect it: they size small relative to their capital, define the loss before entering, and never let a single trade threaten the account. The math of drawdown recovery is unforgiving enough without leverage accelerating the fall. Used with strict position sizing, leverage is a tool; used on emotion, it is a countdown.