Watch the following two StatQuest videos, and then describe what PCA is used for and explain how it works (very high level, no need for the math :)).
StatQuest YouTube videos on PCA:
Short, high-level overview (StatQuest: PCA main ideas in only 5 minutes!!!)
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PCA, step-by-step:
StatQuest: Principal Component Analysis (PCA), Step-by-Step (youtube.com)