
der Marktplatz
market square
A central public square in a town or village where markets take place regularly.
Jeden Samstagmorgen kaufe ich frisches Gemüse auf dem Marktplatz.
Every Saturday morning I buy fresh vegetables at the market square.
market square / marketplace
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market square
A central public square in a town or village where markets take place regularly.
Jeden Samstagmorgen kaufe ich frisches Gemüse auf dem Marktplatz.
Every Saturday morning I buy fresh vegetables at the market square.

online marketplace
A virtual platform on the internet where different providers can sell goods or services.
eBay war einer der ersten großen Online-Marktplätze.
eBay was one of the first major online marketplaces.
'Marktplatz' is a compound noun made up of 'der Markt' (the market) and 'der Platz' (the square/place). So it literally describes a square where a market takes place. This logic helps you understand the basic meaning.
Das alte Rathaus steht direkt am Marktplatz.
The old town hall is located directly on the market square.
You can tell from the context whether the physical or virtual place is meant. Words like 'online', 'digital', 'im Internet' (on the internet), or names of platforms point to the digital meaning. Words like 'Stadt' (town/city), 'Dorf' (village), 'Brunnen' (fountain), or 'Rathaus' (town hall) point to the real square.
Auf dem zentralen Marktplatz der Stadt findet ein Fest statt.
A festival is taking place on the central market square of the city.
For the real market square, the prepositions are important. You are 'auf dem Marktplatz' (on/at the market square; dative, location), and you go 'zum Marktplatz' (to the market square; dative, direction) or 'auf den Marktplatz' (onto the market square; accusative, direction with entering the area).
Wir treffen uns um 14 Uhr auf dem Marktplatz vor dem Brunnen.
We'll meet at 2 p.m. on the market square in front of the fountain.
market
Markt refers to the economic trading sector as a whole, while Marktplatz refers to a specific platform where different sellers and customers come together. Both words are possible when talking about online commerce. Use Marktplatz when you mean the intermediary platform, and Markt when you mean the trading sector in general.

Auf diesem Online-Marktplatz verkaufen viele Anbieter gebrauchte Fahrräder.
Many vendors sell used bicycles on this online marketplace.
Der Markt für gebrauchte Fahrräder wächst jedes Jahr.
The market for used bicycles grows every year.