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Hi there and welcome
A like is when someone liked a tweet and press on the heart icon to indicate they like it.
The likes are a total over the entire time frame.
There is an extensive review of likes when Twitter implemented it (it replaced favourites) and it is worth reading here
But in a nutshell, if someone likes a tweet they click the heart to indicate this.
You're most welcome!
It is genuine (probably a lot of bots but the majority is likely real), but they are not making many tweets that people like, that's usually the case