A noob's question about the 'let' instruction in BJS

Sorry if I sound like a total noob asking this question, but I just have to ask:
What is the true meaning of ‘let’…function (VS the ‘standard input’, I’m not speaking about a constructor) in BJS? Is this simply .js or is there anything else behind it for BJS? I think I saw some examples (also from blender exports) where I can just not get the meaning/interest of using ‘let’… Out of curiosity, and since you guys in this forum are so enlightened and helpful people, I thought I would ask…

Note: Feel free to lol me, I don’t mind. This is also perfectly fine with me as long as I get the answer;)

Its JavaScript let - JavaScript | MDN

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Thank you!
Have a great sunday :smiley:

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