NTFS and FAT are file system formats used by Windows. "NTFS/FAT data recovery for Windows" refers to software and techniques used to recover data from storage devices (hard drives, SSDs, USB drives, etc.) that use either the NTFS (New Technology File System) or FAT (File Allocation Table) file system. When data is lost due to accidental deletion, formatting, virus infection, or drive failure, these recovery tools attempt to reconstruct the file structure and retrieve the lost information.

These tools work by :

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Scanning the drive:

They deeply scan the storage device[SQ]s raw data looking for file signatures and fragments of deleted files.
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Recovering file fragments:

They attempt to piece together these fragments to reconstruct complete files.
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Undeletion:

For recently deleted files, they may be able to simply restore the file entries in the file system[SQ]s directory structure.
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Data carving:

This technique looks for known file headers and footers to identify and extract files even if the file system[SQ]s metadata is corrupted or missing.

There are many commercial and free NTFS/FAT data recovery tools available for Windows. The success of data recovery depends on several factors including:

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The cause of data loss:

Some causes of data loss are more easily reversible than others. For instance, simple deletion is usually easier to recover from than a complete drive overwrite.
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Overwriting of data:

If new data is written to the affected area of the drive, recovery chances decrease significantly. The sooner you attempt recovery, the better.
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The quality of the recovery software:

Different tools have varying degrees of effectiveness.
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The health of the storage device:

Physical damage to the storage media can make recovery more difficult or impossible.

In short, "NTFS/FAT data recovery for Windows" encompasses the process and software used to retrieve lost files from Windows storage devices using those specific file systems.