 Python is also known as a zero-based language. A lot of problems are, except other languages are not will be like CSS and Visual Basic. Those are one-based language. Zero-based language, because we count the position of a character where we're in the list from the index of zero. That's why it's called zero-based. So if you were to count this word Python, then the capital P here is in the zero position. And we call the zero position as zero index. And this is really important to understand. So later on, we start in looping through a list of letters or words or data. So zero is always the first position and for all zero-based language. So that's what that means.