Difference between ::: and ++

Question

For a scala list, what is the difference between

:::

and

++

From doc

:::  Adds an element at the beginning of this list.
++  Returns a new list containing the elements from the left hand operand followed by the elements from the right hand operand.

Answer 1

::: concatenate two lists eg. list1 ::: list2

++ concatenate any two collections eg. list1 ++ list2. Note available only from scala 2.8.