der Serbe
Serb
A male person who comes from Serbia or has Serbian citizenship.
Der Tennisspieler Novak Djokovic ist ein berühmter Serbe.
The tennis player Novak Djokovic is a famous Serb.

Serb
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Serb
A male person who comes from Serbia or has Serbian citizenship.
Der Tennisspieler Novak Djokovic ist ein berühmter Serbe.
The tennis player Novak Djokovic is a famous Serb.

This word belongs to the N-declension. This means it takes the ending '-n' in all cases except the nominative singular. This is a common mistake among learners.
Ich habe gestern einen Serben kennengelernt.
Yesterday I met a Serb.
The word 'Serbe' (Serb) is part of a word family. The country is called 'Serbien' (Serbia), the female form is 'die Serbin' (female Serb), and the adjective is 'serbisch' (Serbian).
Die Hauptstadt von Serbien ist Belgrad.
The capital of Serbia is Belgrade.
When describing nationality as a characteristic or profession, no article is often used. You say 'Er ist Serbe' (He is a Serb), similar to 'Er ist Lehrer' (He is a teacher).
Mein Nachbar ist Serbe und lebt seit zehn Jahren in Deutschland.
My neighbor is a Serb and has lived in Germany for ten years.
Serbian
'der Serbe' and 'serbisch' both refer to Serbia, but grammatically they do not belong together. 'der Serbe' is a noun and means a man from Serbia or with Serbian citizenship. 'serbisch' is an adjective and describes something that belongs to Serbia, its culture, or its language. Learners may confuse the words because they look similar. But you say 'Er ist Serbe' (He is a Serb) when talking about the person, and 'serbische Musik' (Serbian music) or 'serbisch sprechen' (to speak Serbian) when describing something.

Mein neuer Nachbar ist Serbe und lebt seit zwei Jahren in Berlin.
My new neighbor is a Serb and has been living in Berlin for two years.
Tara lernt serbisch, weil sie im Sommer nach Belgrad reisen möchte.
Tara is learning Serbian because she wants to travel to Belgrade in the summer.