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In this code we use slicing, where we get parts of the string by specifying the index range.
Here, b[-5:-2] means a substring from the fifth character from the bottom(including this character) to the second character from the bottom(excluding this character). Therefore, the "orl" in the string "World" is this substring.
Note that in Python, strings can be indexed either positively or negatively. The positive index counts from the beginning of the string, with the index of the first character being 0, in ascending order. Negative indexes count from the end of the string, and the index of the first character from the bottom is -1, decreasing in order. Thus, b[-5:-2] actually represents a substring from the fifth to the third character from the bottom.