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

[BaitHonkey (awita)]

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?

[un1ND3X (ice)]

Please see this post:

Question regarding looping

When you call different iterators, values are returned - ipairs for instance returns an iterator function, which itself returns the current index and value, you can store the index and value with any variable you want, people commonly use i, v in reference to the current index, value respectively. The underscore (_) is a placeholder variable, people typically use it when they don’t require a certain value, for example when you need to traverse a dictionary but only need the keys: for k, _ in …

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:

@XxELECTROFUSIONxX

ipairs for instance returns an iterator function, which itself returns the current index and value, you can store the index and value with any variable you want, people commonly use i, v in reference to the current index, value respectively.