Why do people use for i = 1, 100 do?

I just want a brief explanation about why people use ** I** as a variable, I have searched for an explanation but I haven’t come to one yet.

Basically that is a loop and

The i is equal to the index at which you start the loop, the 100 is where you finish the loop; if you dont specify and increment then it’s defaulted to 1

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Oh ok , i think i understand the basic for it