From The Richest, the list of the most of expensive acquisitions by Google is composed of companies that could provide upgrade and progress for this Internet search engine company. This list showcases the billions and millions of dollars that Google have for their technology growth of expansion.

Google Inc. is one of the fastest growing companies in today's business world, expanding their way through different sectors of the corporate world to upgrade their own system to gain more revenue and be a technology essential in this age. Within a span of 10 years, Google has acquired more than 100 companies. To acquire these prominent companies, like Motorola Mobility, Google has released check worth of hundreds of billions.

In this list, Google displays a grand strategic way of choosing and making company acquisitions. These five most expensive acquisitions by Google are part of a massive expansion of providing their best service and creating more sources. These billions or million acquisition by Google are companies that have upgraded the face of Google.

These are the five most expensive acquisitions by Google:

1.      Motorola Mobility

The biggest and most expensive acquisition by Google to date is the Motorola Mobility, with the price tag of $12.5 billion dollars. Motorola Mobility was acquired and run by Google back in 2012, as a separate business. One reason behind this acquisition is Google's intention to develop their Android OS, with Motorola Mobility being one of the most notable names in the phone technology world.

2.      Double Click

After the battle of acquisition between Google and Microsoft back in 2008, Double Click became the second largest acquisition by Google for $3.1 billion. Double Click, an online advertising platform company, was originally founded in 1995. With this acquisition, Google finally expanded their advertising technology and its list of networks and clients.

3.      YouTube

Acquired for $1.65 billion by Google in 2006, the YouTube deal became one of the most expensive of all time. Google renovated the face of online video and maximized the opportunity of gaining revenue from YouTube's advertising function. 

4.      Admob

Fourth on this list is Admob, which was acquired by Google in 2009. Admob is one of the best mobile-device advertising companies, hence, a beneficial acquisition for Google. This $750 million acquisition allowed Google to expand their mobile advertising and develop their mobile applications. After the deal, Admob and Google have continued to grow within the mobile business.

5.      ITA Software

Last on this list is Google's 2010 acquisition of ITA Software. It is a solid flight research engine with a great global reputation. With ITA Software, Google has acquired the technology of ITA with its vast and organized information within the travel technology. This $700 million dollar acquisition has provided Google to expand their platform for users on concerns regarding airlines and other travel agencies.