a small candle also known as a nightlight, they burn for hours and are contained in a thin metal casing, if left to burn for long enough , the wax will completely liquefy. They can come in many exciting scents and colours but are most commonly white and without a scent. people put them floating in a glass of water or in a small patterned cup or lantern to decorate, create an atmosphere or jazz up an area.
person 1: the guests should be arriving to the party soon but the table is lacking something.. and i can't for the life of me put my finger on what it is!
person2: Here, wack some tealights in these colourful glasses and voila! see how the lightshines through and reflects the colours!