Vowels, the most important building block of English language, are the sounds a, e, i, o, and u make when pronounced. Synonyms for vowels include vocoids and sonants, both of which denote sounds that are voiced and can make distinct noise without the restriction of any obstructions to the airflow. Glides and semivowels are also deemed related to vowels since they share vowel qualities, yet they are different in the ways air move. Ultimately, the importance of vowels cannot be understated as they make words understandable to listeners, and they are a critical component of improving speaking fluency and communication in all aspects of life.