der Obstbaum
fruit tree
A tree that bears edible fruit, such as an apple tree, cherry tree, or pear tree.
Im Herbst ernten wir die Äpfel von unserem alten Obstbaum im Garten.
In autumn, we harvest the apples from our old fruit tree in the garden.

fruit tree
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fruit tree
A tree that bears edible fruit, such as an apple tree, cherry tree, or pear tree.
Im Herbst ernten wir die Äpfel von unserem alten Obstbaum im Garten.
In autumn, we harvest the apples from our old fruit tree in the garden.

'Obstbaum' (fruit tree) is a compound noun made up of 'das Obst' (fruit) and 'der Baum' (tree). So it literally refers to a tree that bears fruit.
Wir haben im Garten einen neuen Obstbaum gepflanzt.
We planted a new fruit tree in the garden.
Specific fruit trees are formed according to the same pattern: you combine the type of fruit with '-baum' (tree). Examples are 'der Apfelbaum' (apple tree), 'der Kirschbaum' (cherry tree), or 'der Pflaumenbaum' (plum tree).
Der alte Apfelbaum in unserem Garten trägt jedes Jahr viele Früchte.
The old apple tree in our garden bears lots of fruit every year.
Typical actions are associated with a fruit tree: you can 'pflanzen' (plant), 'schneiden' (prune), or 'pflegen' (care for) it. The tree itself 'blüht' (blooms) in spring and 'trägt Früchte' (bears fruit), which you 'erntet' (harvest) in summer or autumn.
Im Frühling blühen die Obstbäume wunderschön.
In spring, the fruit trees bloom beautifully.
apple tree
'Apfelbaum' and 'Obstbaum' both refer to trees that can bear fruit. The difference is: an Apfelbaum bears apples and is a specific type of Obstbaum. An Obstbaum, however, can also be a cherry tree, pear tree, or plum tree. The words can be confused because every Apfelbaum is an Obstbaum. If you specifically mean apples, 'Apfelbaum' is correct. If the type of tree is not important or you mean different fruit trees, 'Obstbaum' fits better.

Ein Obstbaum braucht viel Licht, damit die Früchte gut wachsen.
A fruit tree needs a lot of light so that the fruit grows well.
Der Apfelbaum im Garten trägt dieses Jahr besonders viele Früchte.
The apple tree in the garden is bearing especially many fruits this year.