Used to refer to the second item, person, or event in a sequence. Often appears with the counter 目 to indicate ordinal position.
二つ目の角を右に曲がってください。
Turn right at the second corner.
He couldn't answer the second question.
The second chair from the left is mine.
Please get off at the second station.
There are two reasons: first is the price, and second is the quality.