What's the difference between an Intel Core i3, i5 and i7?

We've seen many years now of Intel Core i3, Core i5, and Core i7 CPUs releases but most consumers are still asking the same kinds of questions. What's the difference and is it worth paying more for a CPU with more cores?

What's the difference between an Intel Core i3, Core i5 and Core i7 Haswell processor?

Intel I3 Vs I5 Vs I7 – Which Should You Use For Gaming?

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Difference between Intel i3 i5 i7

difference between an Intel Core i3, i5 and i7

What is a Core i3, Core i5, or Core i7 as Fast As Possible

Intel core i3 vs i5 vs i7: Which One Should You Buy? - Make Tech Easier

Intel Core i3 vs. Core i5 vs. Core i7 vs. Core i9

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What is the physical difference between the Intel i3, i5, and i7 and how significant of a difference is created performance wise? - Quora