These are all DOS commands for the old PC DOS operating system.
Copy could copy some combination of file or files (via wildcards) within a given directory, xcopy could do that as well as copy directories, diskcopy could make duplicates of disks usually floppy disks.
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Although not widely used these days, because of the graphical user interface (GUI), DOS command prompt commands like copy and xcopy still have their uses, and every PC technician should still know what they're used for.
the "copy" command is used to copy single files, while "xcopy" will copy entire directories (including subdirectories).
Hope this clears things up.
The copy command copies and combines files.The Xcopy command selectively copies files.