What is meant by google Florida update?

[Rakesh01]

It produced major SERP volatility and reportedly hurt sites using keyword stuffing, excessive anchor-text optimization, doorway pages, and questionable link tactics. The lesson for webmasters was pretty brutal:
chasing ranking loopholes may work temporarily, but an algorithm update can turn that "SEO win" into an instant traffic wipeout.

[catexotica]

The Google Florida Update was a major Google search algorithm update launched in November 2003 to improve search result quality and reduce the ranking of low-quality websites.
It significantly changed website rankings, especially affecting sites that relied heavily on keyword stuffing and manipulative SEO techniques.