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)