Sure. Here's an updated version of the function `is_palindrome` with a docstring explaining what a palindrome is:

```py
def is_palindrome(string: str) -> bool:
    """
    Check if a string is a palindrome.
    
    A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward.
    
    Parameters:
    string (str): The input string to be checked.
    
    Returns:
    bool: True if the string is a palindrome, False otherwise.
    """
    return string == string[::-1]
```
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