Loan words in Sri Lankan Tamil came about mostly due contact between colonial powers and the native population. Linguists study a language's lexicon for a number of reasons. Languages such as Tamil with centuries of literature and multi-cultural contact offer the chance to compare the various processes of lexical change. The words of foreign origin or loanwords illustrate those processes: calques, loanwords, the distinction between function words and content words. Note: For information on the transcription used, see National Library at Calcutta romanization and Tamil script.