Define 'string slicing' in Python.

String slicing in Python refers to the technique of extracting a substring from a larger string by specifying a range of indices. This allows you to create a new string that includes a portion of the original string, starting from a designated beginning index up to, but not including, an ending index. The syntax for string slicing is typically string[start:end], where start is the index of the first character you want to include and end is the index of the first character you do not want to include. This method is particularly useful for manipulating and analyzing text data within strings efficiently.

Other options provided do not accurately describe string slicing. Changing the case of a string involves using methods like .upper() or .lower(), joining strings refers to concatenation, and counting characters involves using the len() function, none of which pertain to the concept of slicing.