The illiteracy rate is one indicator of a country's educational level.
illiterate person
Refers to a person who cannot read or write. Can be perceived as derogatory; more neutral terms include 非識字者 or descriptive phrases like 読み書きができない人.
In the past there were many illiterate people, but thanks to compulsory education the number has decreased.
ignorant and illiterate; uneducated and illiterate
ignorance and illiteracy
Composed of 文 (writing, literature) and 盲 (blind). The literal sense is 'blind to writing', i.e., unable to read. The exact historical derivation is uncertain, but the compound follows a common pattern for describing disabilities or deficiencies.