Who are the Aryans?

the term "Aryan" was adopted as a racial category through the works of Arthur de Gobineau, whose ideology of race was based on an idea of blonde northern European "Aryans" who had migrated across the world and founded all major civilizations, before being degraded through racial mixing with local populations. Aryan was also used for the Nazis as "The perfect master race". Back then I'm a bit sure but the Aryan race may refer to Indian and Iranian people because again Europeans discovered the land of theirs and I'm guessing some might have mixed which that makes them.

Let me tell you, the Aryans are the white super race that Adolf Hitler wanted to rule the world. They specifilicly had blonde hair and blue eyes and were western european pure whites.

As crazy as it sounds im not wrong