How does Google earn money??

How do Search Engines Make Money?
Looking at financial reports, you will see that most search engines lose money. Even though the search engines have made our modern use of the internet possible, they can't operate without money coming in. They are generally very secretive about their income sources, so the techniques listed here will not apply to all search engines. Not all search engines use all of these revenue sources. Like many ethical issues, the income sources are at the root of most questionable ethics. Here are some of the sources:

1. Charge advertisers for presenting online "banner" ads to users
2. Collect marketing data on consumer habits, then selling the data or using it for targeted advertising.
3. Charging websites to become listed
4. Charging websites for better placement in lists
5. Charging websites to purchase keywords for themselves
6. Charging users for searches
7. Charging other search engines to use their catalog