Autobiography is an account of one's life written by the individual himself. In Tamil, the word Autobiography is known as தனிச்சொற்கள் (taniChorKall).
Generally, an autobiography consists of the basic facts of one's life such as name, birth place, birth date, education, family, occupation, etc. Furthermore, an autobiography often also includes stories and experiences of a person.
Thus, Tamil autobiographies can be said as தனிச்சொற்களுடன் ஒரு தனிப்பட்டியல், குறிப்புகள், கதைகள் மற்றும் அனைத்தும் தனிக்கு உருவான அறிவுரை (TanichorKallutaan OruTanippaTiyal, KurippuKall, KadhaiKall Matrum AnaitthaTanikku Uruvaan Arivurai).
For more information, you can also refer to this Tamil language web page about autobiographies - https://ta.wikipedia.org/wiki/%E0%AE%A4%E0%AE%A9%E0%AE%BF%E0%AE%9A%E0%AF%8D%E0%AE%9A%E0%AF%8A%E0%AE%B1%E0%AF%8D%E0%AE%95%E0%AE%B3%E0%AF%81%E0%AE%9F%E0%AE%A9%E0%AF%8D