Google makes improvements to the ranking algorithm nearly every single day. Several of them are minor tweaks; some shake up the SERPs severely. Google's algorithms construe as an enlightened method used for extracting data from its search database and providing the best possible results for a question instantly. Using a mixture of algorithms and various ranking signals, the search engine offers web pages ranked by importance on its SERPs (search engine results pages).
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
Page layout algorithm
Exact match domain (EMD)