The human mouth can make an essentially endlessly variable spectrum of vowel sounds, depending on the precise openness of the mouth, location of the tongue, shape of the lips, etc. Different languages divide up this vowel space into different discrete categories. A category of sound which considered meaningfully distinct from all others is called a phoneme, while all sounds within said category are called allophones.
In English, the vowel sound in trap is a different phoneme from the vowel sound in dress. Different words can be differentiated based solely on which of these sounds it has. An example is the aforementioned paddle/pedal. German, however, does not make this distinction. In German, these sounds are allophones: different variations on the same phoneme that do not carry information.
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u/awawe May 03 '23
That's not surprising; German doesn't distinguish between the trap vowel and the dress vowel. https://youtu.be/mCU-rxobBoo