
selten
rare
Not occurring or existing often; scarce.
Diese Briefmarke ist extrem selten und wertvoll.
This stamp is extremely rare and valuable.
rare / seldom
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rare
Not occurring or existing often; scarce.
Diese Briefmarke ist extrem selten und wertvoll.
This stamp is extremely rare and valuable.

seldom
At long intervals; not often.
Ich gehe nur noch selten ins Kino.
I only seldom go to the movies anymore.
'Selten' can describe a noun as an adjective or describe how often something happens as an adverb. As an adjective, it is declined; as an adverb, it remains unchanged.
Das ist eine seltene Pflanze.
That is a rare plant.
As an adverb of frequency, 'selten' (seldom) usually comes directly after the conjugated verb and before other parts of the sentence.
Ich esse selten Fleisch.
I seldom eat meat.
In the meaning 'rar' (rare), 'selten' is often combined with nouns such as 'Gelegenheit' (opportunity), 'Gast' (guest), 'Exemplar' (specimen / copy), or 'Anblick' (sight).
Ein solches Angebot ist eine seltene Gelegenheit.
Such an offer is a rare opportunity.
hardly / barely
Selten means that something does not happen often. Kaum is stronger and expresses, for events, that they happen almost not at all. Use selten for a low frequency and kaum when something seems to be almost completely absent.

Seit seinem Umzug besucht Paul seine Eltern nur noch selten.
Since moving away, Paul visits his parents only rarely.
Seit seinem Umzug besucht Paul seine Eltern kaum noch.
Since moving away, Paul hardly ever visits his parents.