Vowel changes refer to alterations in the pronunciation or quality of vowel sounds in a language. These changes can occur due to various factors, including regional accents, historical language evolution, or phonetic environments. For example, in the English language, the vowel sound in the word "goose" has shifted over time, leading to different pronunciations in various dialects. In linguistics, vowel changes are often studied in the context of phonetics and phonology. They can also be observed in language families, such as the Germanic languages, where systematic vowel shifts, like the Great Vowel Shift, have significantly impacted the way words are pronounced today.