How to change ubuntu to root?

I am new to linux. when i list the files under folder 1, i see below result

-rwxrwxrwx 1 root   root      920 Jun  3 10:36 file1.xsd
-rwxrwxrwx 1 root   root      920 Jun  3 10:36 file2.xsd
drwxrwxrwx 2 ubuntu ubuntu   4096 Jun 12 11:10 temp
-rwxrwxrwx 1 ubuntu ubuntu   1853 Jun 19 11:07 file3.xsd

for some files(file1 and file2) root root is written after permisionsbut for file3 ubuntu ubuntu is displayed.

what is difference b/w ubuntu ubuntu and root root ?

How can i change ubuntu ubuntu for file 3 to root root ?

Source: linux

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