Google ranks pages according to 200 factors and makes hundreds of changes to its core search algorithm every year.
Most of those updates are minor and we users see minimal effects.
Some updates, however, are huge, and businesses have been known to suffer overnight as a result.
Why does google update its algorithm? Because Google, above all, wants people to keep using Google, so they have to stay ahead of the game (they own the game) and keep weeding out the rubbish, low-value content that appears in their search results.
For a history of major Google algorithm updates since 2000, click here.
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