What is Bait and Switch?
In SEO, the "bait and switch" technique involves optimizing a webpage for certain popular keywords to achieve high rankings.
Once the desired ranking is achieved, the content of the page is switched to the actual content that the site owner wants to promote. The intention is to mislead search engines to drive traffic to the site.
For example, a webpage might initially be filled with content about a popular topic to rank well in search results for keywords associated with that topic.
Then, once the page has achieved high rankings, the content is replaced with content on a completely different topic that the site owner actually wants to promote.
This practice is against Google's Webmaster Guidelines, and websites using such tactics are liable to be penalized.