Why use a trema?

A trema, or diaeresis, is used in writing to indicate that two adjacent vowels should be pronounced separately rather than as a single sound. This is particularly important in languages like French and Spanish, where vowel combinations can change the pronunciation and meaning of Words. For example, in French, "Noël" uses a trema to clarify that the "o" and "e" are pronounced distinctly. Utilizing a trema helps maintain clarity in pronunciation and communication.