人民 rénmín the people

How to remember 人民: 人 person + 民 citizens = the people.

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'The people' as a collective political body - 人民政府 (rénmín zhèngfǔ) the people's government; 为人民服务 (wèi rénmín fúwù) serve the people.
Formal and often official/political; you wouldn't use it for a random group of individuals (use 人们 rénmen, people/folks, for that).
Abstract collective noun; contrast 人口 (headcount) and 公民 (gōngmín, citizen in the legal sense).