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Reversing a string means to change the order of its characters, so that the last character becomes the first, the second-to-last becomes the second, and so on.
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Substring: A substring is a smaller part of a larger string. It can be obtained by extracting characters from within the original string.
Length: The length of a string refers to the number of characters it contains.
Concatenation: Concatenation is combining two or more strings together to create a new string.