The Internet is the perfect place to find answers to all your questions. Google is the king of search - I use it dozens of time a day - but it's not the most privacy-friendly search site out there. It stores your information for advertising and who knows what else.
If that worries you, you'll be happy to know that you can take your privacy into your own hands. Don't compromise your personal information, instead of using the big name search engines, try DuckDuckGo.