[Python] what is "size - 1" argument in this loop?

word = input("Enter a word: ")
print("Original String is: ", word)

size = len(word)

print("Prnting only even index chars")
for i in range(0, size - 1, 2):
print("index[", i, "]", word)


I need to understand whether "size - 1" was a subtraction or something else.

I've tried to replace "size - 1" with just "8" and got the same answer. Because the word has 8 characters.

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