Functional illiteracy is imprecisely defined, with different criteria from nation to nation, and study to study. However, a useful distinction can be made between pure illiteracy and functional illiteracy. Purely illiterate persons can not read or write in any capacity, for all practical purposes. In contrast, functionally illiterate persons can read and possibly write simple sentences with a limited vocabulary, but can not read or write well enough to deal with the everyday requirements of life in their own society.
an illiterate person can also be called as
Purely illiterate persons can not read or write in any capacity functionally illiterate persons can read and possibly write simple sentences with a limited vocabulary, but can not read or write well enough to deal with the everyday requirements of life