In general, we use to call files like text files, audio files, video files, pictures present on a computer device as data that can be heard by other computing devices using a wireless connection, media cables, or storage devices like memory cards, pen drives, hard disk, and so on. However, within these storage devices, these data files are stored as a sequence of 0s and 1s. We that called bits. So when we transfer a file from a pen drive to a computer hard disk we move and store a sequence of binary bits. CPU process these bits and presents a text file on the computer screen which we can read. However there ate chances of getting these storage devices corrupted which can lead to loss of essential data and we too can accidentally lead some critical files from our devices. In such cases are there any possibilities of recovering lost data. The answer is yes we can recover it and the process is called data recovery. Each file present on a storage device has a pointer that tells the operating system where the file data start and where ends. As long as a file has a pointer it can be seen on the computer screen. When this pointer is no longer available the operating system can not block the file and text it to be deleted. The same things happen when you delete a file from a computer. The operating system deletes the point out of the file and marks the scratch is occupied as unreserved.