A candle: a wax object with a wick that is lit to provide light. Usually written in kana, though the kanji 蝋燭 exists.
停電でろうそくを何本か灯した。
During the power outage, we lit several candles.
誕生日ケーキの上にろうそくを立てて火を吹き消した。
We put candles on the birthday cake and blew them out.
古い寺院の祭りでは蝋燭の行列が行われる。
At the festival of the old temple, a procession of candles is held.