What does put a candle in the window mean?

"Put a candle in the window" is a phrase that signifies offering hope, guidance, or a welcoming gesture, often associated with waiting for someone to return home or seeking solace during difficult times. It evokes a sense of warmth and light in times of darkness, symbolizing the idea of keeping a light burning for those who are lost or away. Historically, it has been used in various cultural contexts, including the traditions of hospitality and remembrance.