This code checks if the string variable `word` starts with...

This code checks if the string variable word starts with the characters "kn". If it does, the code creates a new version of the string word without its first character (k).

Here is a step-by-step breakdown:

1. word.startsWith("kn"): This checks whether the string word begins with the prefix "kn" (i.e., the first two characters must be "k" followed by "n").

2. word.substring(1): If the condition is true, word.substring(1) creates a new string starting from the second character (index 1) of word and excludes the first character (k). The "n" will remain part of the new word.

3. word =: The new string (with the updated value) is reassigned back to the word variable.

In summary, this code removes the first character (k) from the string word if that string starts with "kn". If it does not start with "kn", the word remains unchanged.