If you have listened to any music, you have definitely heard dominant chords played. They are very common in jazz music and other genres.
A dominant chord contains a number after it, such as “7” (example C7). Identify the dominant chord by the following: 7, 7th, other numbers such as 9 or 13. The “dom7” symbol is also used.
In essence it can be remembered as the chord that has just a number after it; no minor or major.