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Concatenation
Concatenation is joining two or more strings end to end to produce one new, longer string.
Delimiter
A delimiter is the character or sequence of characters that marks the boundary between fields inside one string, such as the comma in a line read from a CSV file.
Immutability
Immutability means a value cannot be changed once it has been created. Strings in Java and Python are immutable, so every string operation returns a new string and leaves the original one as it was.
substring
A substring is a portion of a string, obtained using an index or slicing operation.