They are Intel model numbers. Basically it means whatever the marketing department at Intel wants them to mean. Generally bigger numbers is better, or at least more expensive. It could be because the parts are newer, have more cores or cache, or better quality, but that may not always bet the case. In general i3 is the brand used for low end CPUs, i5 for normal desktop CPUs, i7 for businesses and high end consumers and i9 for top of the line CPUs. The rest of the numbers can mean anything the marketing department wants however the first digit is generally the generation number of the Intel Core architecture.
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