The short version
Negotiation is a structured conversation about who gets what, and it is learnable. The research is clear that preparation and questions beat aggression: the best negotiators know their alternatives, ask more, and talk less.
What it actually is
Every negotiation has the same skeleton: what you want, what they want, and what each side does if no deal happens. That walk-away option, your BATNA, quietly sets the price of everything. Strengthening it before the conversation moves the outcome more than anything you say in the room.
Why it matters more than it feels
Salary, deadlines, scope, rent, vendor contracts: the average professional negotiates weekly without naming it. Small deltas compound; a single well-negotiated offer can be worth more than a year of raises.
How to think about it
Treat it as information gathering first. Questions like what matters most to you here, and what would make this easy to say yes to, surface trades where you give something cheap to you and valuable to them. Deals come from differences, not similarities.