der Gewinn
profit
The financial surplus that remains after all costs have been deducted from revenue; profit.
Das Unternehmen konnte im letzten Quartal einen hohen Gewinn erzielen.
The company was able to make a high profit in the last quarter.

profit / prize
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profit
The financial surplus that remains after all costs have been deducted from revenue; profit.
Das Unternehmen konnte im letzten Quartal einen hohen Gewinn erzielen.
The company was able to make a high profit in the last quarter.

'Der Gewinn' (profit/prize/gain) is the noun related to the verb 'gewinnen' (to win/gain). Anything that you can 'gewinnen'—money, a prize, experience—can also be 'ein Gewinn'.
Wenn wir dieses Spiel gewinnen, ist der Pokal unser.
If we win this game, the cup is ours.
In an economic context, 'Gewinn' (profit) is often combined with certain verbs. Typical ones are 'Gewinn machen' (to make a profit), 'Gewinn erzielen' (to achieve/make a profit; more formal), and 'Gewinn abwerfen' (to yield a profit, when an investment is profitable).
Mit diesem Produkt machen wir endlich wieder Gewinn.
With this product, we are finally making a profit again.
For intangible benefit, 'Gewinn' (gain/benefit) is often combined with 'persönlich' (personal), 'echt' (real), or 'groß' (great). The structure 'ein Gewinn für ...' is very common to describe the benefit for a person or group.
Deine Hilfe war ein echter Gewinn für unser Projekt.
Your help was a real gain for our project.
price / prize
'der Preis' and 'der Gewinn' can both mean something you receive in a competition, game, or lottery. 'der Preis' often sounds like an award for an achievement, for example in a competition. 'der Gewinn' emphasizes more strongly that you have won something, for example money or an object. Learners may confuse the words because a 'Preis' can also be a 'Gewinn'. The important point is: not every 'Preis' is money, and 'Gewinn' can also simply be the thing that was won.

Heute ist der Gewinn aus der Tombola ein Gutschein für ein Restaurant.
Today the prize from the raffle is a voucher for a restaurant.
Er hat zu Hause stolz den Preis gezeigt, den er beim Malwettbewerb bekommen hat.
At home, he proudly showed the prize he received in the painting competition.