Google has only made a couple of changes to its algorithms in its formative days. Today, every year, Google makes thousands of improvements. A majority of these changes are so small that they go unnoticed altogether. Nonetheless, the search engine periodically rolls out significant algorithmic updates which have a huge effect on SERPs such as:
Intrusive interstitials update
Fred
RankBrain
Mobilegeddon
Penguin
Panda
Pigeon
Hummingbird
Page layout algorithm
Payday
Exact match domain (EMD)
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