
der Handel
trade
The buying and selling of goods and services; the economic activity of exchanging goods.
Der Online-Handel hat in den letzten Jahren stark zugenommen.
Online trade has increased sharply in recent years.
trade
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trade
The buying and selling of goods and services; the economic activity of exchanging goods.
Der Online-Handel hat in den letzten Jahren stark zugenommen.
Online trade has increased sharply in recent years.

available in stores
Available for customers to buy in shops.
Das neue Buch ist ab nächster Woche im Handel erhältlich.
The new book will be available in stores starting next week.

deal
A single business transaction or agreement; a deal.
Er hat einen guten Handel gemacht und das gebrauchte Fahrrad sehr günstig bekommen.
He made a good deal and got the used bicycle very cheaply.

dispute / affair
Colloquial and somewhat old-fashioned for a dispute, an argument, or an annoying matter.
Ich will mit diesem ganzen Handel nichts mehr zu tun haben.
I don't want to have anything more to do with this whole affair.
'Der Handel' (trade) is the noun related to the verb 'handeln' (to trade). A person who engages in trade is 'der Händler' (the dealer/merchant) or 'die Händlerin' (the female dealer/merchant).
Dieser Händler handelt mit seltenen Gewürzen aus aller Welt.
This dealer trades in rare spices from all over the world.
The word 'Handel' (trade) is a very productive component of compound nouns related to the economy. Examples are 'Einzelhandel' (retail), 'Großhandel' (wholesale), or 'Online-Handel' (online trade).
Der Einzelhandel leidet unter der Konkurrenz aus dem Internet.
Retail is suffering from competition from the internet.
A fixed and somewhat more formal expression for 'handeln' (to trade) is 'Handel treiben' (to engage in trade). It is often used with the preposition 'mit' (with) to name the goods or the partners.
Die Firma treibt seit vielen Jahren Handel mit asiatischen Ländern.
The company has been trading with Asian countries for many years.
The phrase 'im Handel' (available in stores/in trade) is a fixed expression and means 'to buy in shops'. It is usually combined with verbs such as 'sein' (to be), 'erhältlich sein' (to be available), or 'finden' (to find).
Das Produkt ist ab sofort überall im Handel erhältlich.
The product is now available in stores everywhere.
In the meaning 'Streit' (dispute) or 'lästige Angelegenheit' (annoying matter), 'Handel' is colloquial and rather rarely used today. You may still sometimes find it in spoken language.
Wegen einer Kleinigkeit hatten die beiden einen furchtbaren Handel.
Because of a small matter, the two of them had a terrible dispute.
market
Markt refers to the economic system or environment in which supply and demand meet. Handel, by contrast, refers to the activity of buying and selling. Markt is therefore suitable when talking about prices and demand, while Handel is used for the activity of exchanging or selling goods.

Der Handel mit Kaffee verbindet Produzenten und Käufer.
The coffee trade connects producers and buyers.
Auf dem Markt bestimmen Angebot und Nachfrage den Preis von Kaffee.
On the market, supply and demand determine the price of coffee.