der Cake
loaf cake
A moist sponge-style cake, usually baked in a loaf pan, often refined with fruit, nuts, or chocolate.
Zum Nachmittagstee servierte sie einen selbstgebackenen Zitronen-Cake.
For afternoon tea, she served a homemade lemon loaf cake.

cake
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loaf cake
A moist sponge-style cake, usually baked in a loaf pan, often refined with fruit, nuts, or chocolate.
Zum Nachmittagstee servierte sie einen selbstgebackenen Zitronen-Cake.
For afternoon tea, she served a homemade lemon loaf cake.

The word 'Cake' is especially common in Switzerland and in parts of Austria. In large parts of Germany, the terms 'Kastenkuchen' (loaf cake) or 'Rührkuchen' (sponge-style cake) are more usual.
In der Schweiz isst man zum Kaffee gerne einen Cake.
In Switzerland, people like to have a cake with coffee.
In German, 'Cake' does not refer to every kind of cake. It almost always means a sponge-style cake baked in a long loaf pan.
Für das Picknick backe ich einen einfachen Marmor-Cake.
For the picnic, I'm baking a simple marble loaf cake.
'Cake' is often combined with an ingredient that determines the flavor. Typical examples include 'Zitronen-Cake' (lemon loaf cake), 'Schokoladen-Cake' (chocolate loaf cake), or 'Marmor-Cake' (marble loaf cake).
Ihr Schokoladen-Cake ist besonders saftig und bei allen beliebt.
Her chocolate loaf cake is especially moist and popular with everyone.
cake
'der Kuchen' and 'der Cake' both refer to sweet baked goods from the oven. 'Kuchen' is the normal and very general word for many kinds of sweet baked goods. 'Cake' is narrower: it usually means a moist loaf-style sponge cake, often with fruit, nuts, or chocolate. The words can be confused because every Cake also looks like a Kuchen. If you do not mean exactly this kind, 'Kuchen' is more natural; 'Cake' fits when the specific shape and type are meant.

Herr Hofmann bringt morgen einen Cake mit Nüssen für das Team mit.
Mr. Hofmann is bringing a nut cake for the team tomorrow.
Sie stellt den Kuchen auf den Tisch, damit alle ein Stück nehmen können.
She puts the cake on the table so everyone can take a piece.