Can anyone explain me how the functions Next and In Pairs Mean?

pairs(table) returns next,table,nil.

in a for loop, you can use it to loop over each key,value in the given table.

Eg.

local Example = {
    "Hello";
    "World";
    "Bye!";
}

for _,Value in pairs(Example) do
    print(Value)
end

--[[
    this would print
    Hello
    World
    Bye!
]]