Ruby - What does "sort" do?

Question

Since a[1] is "a", what exactly does "sort" do?

a = ["b", "a", "d", "c"]
a.sort
puts a[1]

Answer 1

b = a.sort
assigns a sorted version of 'a' to the variable 'b' , 'a' isn't changed

a.sort! (👈 exclamation mark)
sorts 'a' and assigns the sorted list to 'a'