PrefixWordExtractor is a PowerShell script that extracts words from a text file which start with predefined prefixes like 'KN', 'HS', 'CI', 'LN', and 'PR', and exports them into a CSV file named "output.csv". It validates the existence of the source text file, reads its content, filters out words based on specified prefixes, and saves the results in a CSV format for further analysis or processing.