A tuple is an immutable list. A tuple can not be changed in any way once it is created. A tuple is defined in the same way as a list, except that the whole set of elements is enclosed in parentheses instead of square brackets. The elements of a tuple have a defined order, just like a list.
Negative indices count from the end of the tuple, just like a list.
Slicing works too, just like a list. Tuples have no append or extend method. You can't remove elements from a tuple. Tuples have no remove or pop method. You can't find elements in a tuple.