What databases store the location history? How are locations obtained? What applications use locations? Are there different levels of accuracy?

In the following format: MS Word, 2.5 full typed pages , 12pt Arial font, single spaced, NO screenshots or pictures, all original content, and any referenced material must be properly documented. For full credit, please answer all the questions with as much detail as possible.
In 2 pages please research the below material:

Research location history on cell phones. The research will be for both the Android OS and the iOS. How accurate is location data/history? What databases store the location history? How are locations obtained? What applications use locations? Are there different levels of accuracy?
Please include other information you found in your research; the above questions are just a guideline to get you started.

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