der Ertrag
return
The financial profit, return, or benefit that results from an economic activity, an investment, or work.
Der Ertrag aus dem Verkauf der Aktien war höher als erwartet.
The return from selling the shares was higher than expected.

return / yield
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return
The financial profit, return, or benefit that results from an economic activity, an investment, or work.
Der Ertrag aus dem Verkauf der Aktien war höher als erwartet.
The return from selling the shares was higher than expected.

'Ertrag' (return/yield) derives from the idea of 'Tragen' (carrying/bearing). The prefix 'er-' indicates a result. So the Ertrag is what something (e.g., a field or an investment) 'bears' or produces as a result.
Die Apfelbäume tragen dieses Jahr gut, wir erwarten einen hohen Ertrag.
The apple trees are bearing well this year; we expect a high yield.
You can recognize the meaning from the context: words like 'Geld' (money), 'Aktien' (shares), or 'Zinsen' (interest) point to the financial return. Words like 'Ernte' (harvest), 'Feld' (field), or 'Weizen' (wheat) refer to the agricultural yield.
Der finanzielle Ertrag der Firma ist im letzten Quartal gesunken.
The company's financial return fell in the last quarter.
In a financial context, 'Ertrag' (return) is often combined with verbs such as 'abwerfen' (to yield/produce), 'bringen' (to bring), or 'steigern' (to increase). People also speak of 'reinem Ertrag' (net return) or 'jährlichem Ertrag' (annual return).
Diese Investition wirft einen guten Ertrag ab.
This investment produces a good return.
In an agricultural context, people often speak of 'Ertrag pro Hektar' (yield per hectare). Typical adjectives are 'hoch' (high), 'gering' (low), 'gut' (good), or 'schlecht' (poor).
Der Ertrag der Kartoffelernte war dieses Jahr leider sehr gering.
The yield of the potato harvest was unfortunately very low this year.
profit / prize
'der Gewinn' and 'der Ertrag' can both mean money or benefit that results at the end of work, a business deal, or an investment. 'Gewinn' usually emphasizes the financial surplus after costs. 'Ertrag' often sounds a bit more general or technical and fits well with investments, projects, or work that brings something in. Learners may confuse the words because both have to do with economic success. A practical tip: for revenue minus costs, people often say 'Gewinn'; for the result of an investment or activity, they often say 'Ertrag'.

Die neue Solaranlage bringt im Sommer einen guten Ertrag.
The new solar system produces a good yield in summer.
Nach Abzug der Miete und der Löhne bleibt dem kleinen Laden kaum Gewinn.
After deducting the rent and wages, the small shop is left with hardly any profit.