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)