A linguistic phenomenon, in which phonemes change on morpheme boundaries when a) two words are uttered next to each other or b) two morphemes are combined to form a new word. For example, if a preceding word ends in a vowel, the initial unvoiced consonant of the next word might become voiced (/t/ becomes /d/). Which sounds change, and how, is language-specific. Sandhi occurs frequently in Sanskrit, hence the name.