Ruby question: for loop vs. iterator

gistfile1.rb

# example 1:
values = [1, 2, 3, 4, 5]
current_value = 0
for value in values do
  current_value = value
end
puts current_value

# example 2:
values = [1, 2, 3, 4, 5]
current_value = 0
values.each do |value|
  current_value = value
end
puts current_value

# Specify the output for each example, and explain why they're similar and/or different.