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The term has no singular definition. But simply put, it’s an ideology rooted in its opposition to capitalism and wanting to shift power from corporations to workers.

By Kellen Browning

Zohran Mamdani, a New York state assemblyman, stunned the Democratic establishment on Tuesday evening with a performance in the Democratic primary for mayor of New York so commanding that his chief rival, former Gov. Andrew M. Cuomo, quickly conceded to him.

Mr. Mamdani’s primary victory is not yet official, and he still faces a competitive general election this fall. But if he is successful, he would become one of the most prominent democratic socialists in the country. Here’s what that label means.