Search engines, including Google, more or less regularly update their search algorithm. With these changes, Google modifies the search criteria. This ultimately results in the content and technical requirements that a website should fulfill in order to achieve a good search engine ranking.
Google updates are feared. This is because each update can mean a change in the search engine results for a website. For example, a website that previously ranked number 1 for a certain keyword may lose its position.
The updates have code names
Google updates almost always have distinctive names. One of the best-known updates is probably the Panda Update. This was named after the Google engineer Navneet Pana.