Sinhala Culture played a major role in the development of Theravada Buddhist literature. The oldest Sinhalese Prakrit inscriptions found are from the third to second century following the arrival of Buddhism in Sri Lanka, while the oldest extant literary works date from the ninth century. The Fonts offered by Sinhala Fonts can be helpful too.
Thus, if you want to communicate with people from Sri Lanka or native users of Sinhalese Language, it is essential to get an understanding of the culture and language.
Native People from Sri Lanka use the Sinhalese Language and Scripts.