You delete your files in Windows Explorer
When a file is deleted from your computer, you just lose the directions of the file in the folder, like the name of a chapter is removed from the book's index. The file is removed to the "Recycle Bin" and still 100% exists with intact data on it. It is easy to recover deleted data from "Recycle Bin" with the "Restore" option.
Deleted data are removed from "Recycle Bin"
When you empty the "Recycle Bin" or press "Shift + Delete" to deal with your files (it bypasses "Recycle Bin" for file deletion), there are still chances to recover deleted data in these scenarios. Though the space occupied by these files is reused by other files, it doesn't get reused straight away. Therefore, the data they contains still stay on your hard drive for some time to come and may be recovered by using some deleted data Recovery software.
Formatted the hard drive and lost the data
Have you accidently formatted your hard drive or portable devices? During or after the formatting, you may find that you have not created a backup of your important data in advance. In fact, quick format does not delete the data. It just marks the head of the section where the data locals by a kind of symbols telling system that this section is re-useable. During a formatting, the system is allowed to re-use the space on your drive by overwriting existing files. Therefore, it is quiet easy to recover formatted data if there is no new data stored after formatting with some specifically designed formatted data Recovery software.
