Your question is Explaining PCA Simply. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Explain a PCA to a 5-year-old.
Give an intuitive explanation using a simple everyday analogy, then briefly connect the analogy to what PCA does mathematically. The answer should distinguish finding important directions from reducing the number of dimensions, and mention what information may be lost. Do not assume prior knowledge of linear algebra.