Just to be a little more succinct, the “Core” series is a brand of processors by Intel. For laptops, there are three tiers, i3s, i5s, and i7s. In general, the higher up you go, the more cores and/or the faster speeds you get. Much like mobile phones, processors generally improve year after year, denoted by generations. So a 9th generation i5 is generally better than, say, a 5th generation i5, even if they’re in the same tier and have similar numbers.
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