Which database does Facebook & Google use ?

Facebook has moved to a NoSQL database named HBase. Google uses their own system called BigTable. What is NoSQL ? NoSQL is a term used to designate databases which differ from classic relational databases. NoSQL database management systems are useful when working with a huge quantity of data when the data's nature does not require a relational model. The data can be structured, but NoSQL is used when what really matters is the ability to store and retrieve great quantities of data, not the relationships between the elements.

How Internal Links are Important for Your Website to Get Higher Rankings in Search Engines ?

What is Internal Linking ? 

Internal Linking: Internal Linking is the part of SEO On Page Optimization and It may be defined as links pointing to other page or pages of same website. The internal linking is very important for getting higher rankings in search engines. Always try to give good internal linking by choosing better keywords so that it will helpful for your user.

To understand, this concept I am taking the following example.

Lets say, I have the following content
SEO i.e. Search Engine Optimization is of two types i.e. On Page Optimization and Off Page Optimization You can read details about at here What is SEO ?
 In this example, I made the three internal links (I make hyperlink on three keywords) On Page Optimization, Off Page Optimization and What is SEO ? and which are pointing to other pages of my website and whenever any one click on these links only my website link related to these keywords will be open. These three links are acting as internal links for my website.

How Internal Linking is Importnat to Get Higher Rankings in Search Engines ?

Search Engines, specially Google is giving very much importance to backlinks and giving value to internal linking. So, it will be beneficial for your website, to give more internal links. Check the following example.
You may notice Wikipedia is coming higher on search engine result pages for any type of query. One of the reason for coming at first position of Wikipedia in Google SERP is that Wikipedia has very strong internal linking.
So try to make useful Internal Linking for your website or blog.

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