What is the difference between for _, v in pairs and for v, i in pairs?

Hello! In a Roblox’s tutorial of Youtube I’ve got seen the loop for _, in pairs and I cannot understand his difference with for i,v in pairs.
What does for _, in pairs?

Please see this post:

to know that essentially, naming a variable either v or i makes no difference and the variables you set would just have an index or value assigned to them when you initiate a for loop, and specifically:

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