for loops

Question

words = ["hello", "world", "spam", "eggs"]
counter = 0
max_index = len(words) - 1

while counter <= max_index:
word = words[counter]
print(word + "!")
counter = counter + 1

what does the [counter] in the 6th line represent? or why do we have to put it there? .please explain.

Answer 1

Just to add to what 「ＨＡＰＰＹ ＴＯ ＨＥＬＰ」 said:
'words' is a list. In lists you use:
list_name[index]
to access the values in the list.
In the code you mention, counter is used as the index for
accessing the elements of list 'words'.
When counter = 0 you get the first element, when it is 1, the second ...

Answer 2

thanks guys ... now i see it 😅