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At Google, much of the profit is from they're primary products:
1. search
2. social
3. ads
This products relies on large-scale data mining.
Data mining systems are placed at the core of interactive services in a rapidly changing and sometimes adversarial environment, statistical models need to be combined with ideas from control and game theory for the best output.
Google Full year financial tables with quarterly data
https://investor.google.com/financial/tables.html
Through agreements and declarations and private partnerships
Collecting marketing information.
the profit comes through advertisements on them .
Advertisements with an expanded database and social contacts at large.
By selling aditional soft wares and apps as well as through advertisement of products.
they profit from their browsers from advertising shows to their users
They profit with SEO, Advertising and Social Media
