Python: for loops

Question

Below is the code, I don't understand how and why "word" came out of nowhere. Does "for' accomplishes the same thing as "while"?

words = ["hello", "world", "spam", "eggs"]
for word in words:
print(word + "!")

Answer 1

"for word in words"
Is a specific python syntax to access all items of a list one by one. You can use any variable name instead of "word".
You can also replace it by
"for i in range (len(words))"
It will do the same. But "for word in words" looks clean and easier to understand

Answer 2

Output
hello!
world!
spam!
eggs!

It's because for loop in words .

Answer 3

Thank you very much!