Schwa, it's like "uhh", like the a in about. The most common sound in American English. In fact the word "America" has a schwa at the beginning and end. Supposedly Flemish Dutch don't use it, Afrikaans use it all the time.
Not sure if you make the sound, it's like a lazy a or u. (IPA:
ə or ʌ)
- ⟨a⟩, as in about [əˈbaʊ̯t]
- ⟨e⟩, as in taken [ˈtʰeɪ̯kən]
- ⟨i⟩, as in pencil [ˈpʰɛnsəl]
- ⟨o⟩, as in memory [ˈmɛməɹi]
- ⟨u⟩, as in supply [səˈpʰlaɪ̯]
- ⟨y⟩, as in sibyl [ˈsɪbəl]
- unwritten, as in rhythm [ˈɹɪðəm]
The ʌ is used in words like in English "cup", "luck", and "putt".
In UK English the schwa is also the final -er like in teacher. But in American English the -er is more pronounced.