The schwa sound is a very common sound in English and many other languages. It's often represented by the symbol ə in the International Phonetic Alphabet (IPA).
Here are some examples of words with schwas:
* About (the "a" in "about" is a schwa)
* Again (the "a" in "again" is a schwa)
* The (the "e" in "the" is a schwa)
It's important to note that the term "schwa" refers specifically to the sound itself, not the written form of the vowel.