Keyword cannibalization occurs when multiple pages on the same website target the same or very similar keywords, causing them to compete against each other in search engine rankings. This overlap can dilute the authority of each page, confuse search engines about which page to prioritize, and ultimately reduce the site's overall visibility for that keyword. Addressing keyword cannibalization typically involves consolidating content, refining keyword strategies, or restructuring internal links to ensure each page targets a unique set of keywords.