"There is a wide gap between spoken and written Tamil. Spoken Tamil is used for face-to-face communication or in informal occasions whereas written Tamil is used during official speeches and other formal occasions. Spoken Tamil is not generally written; thus, while writing, the written form is invariably used. While there is a wide gap between the two forms of Tamil, there are certain rules the use of that help the learner to derive one form of language from another."
January 1, 1970
https://en.wikiquote.org/wiki/Tamil_language