The System Volume Information folder is a protected Windows operating folder. To see it, you have to make Windows show hidden and protected files and folders. Then you will see it on the root of a drive. It is present every partition on your computer and stores crucial information including:

System Restore Points
Volume Shadow Copy
Indexing Service Database
NTFS Disk Quota Settings
Distributed Link Tracking Service Database
DFS Replication and File deduplication service database.