This is the 2040th most frequent Russian word.
азербайджан
Azerbaijan.
In this sentence, 'Азербайджан' is used as a proper noun referring to the country of Azerbaijan.
Азербайджан — это прекрасная страна с богатой культурой.
Azerbaijan is a wonderful country with a rich culture.
Here, 'Азербайджана' is used in the genitive case to indicate possession or origin ('the history of Azerbaijan').
Я изучаю историю Азербайджана, чтобы лучше понять регион.
I am studying the history of Azerbaijan to better understand the region.
In this sentence, 'Азербайджана' is again in the genitive case, specifying that the dishes are representative of Azerbaijan's cuisine.