A "stranger" is someone you do not know. This person could be walking down the street, sitting next to you on a bus, or even someone you see at a store. Strangers can be friendly or unfriendly, and they come from all walks of life. It's important to be cautious around strangers, as you never know their intentions. Meeting a stranger can sometimes lead to new friendships or interesting conversations. For example, you might meet a stranger at a coffee shop who shares your love for books or travel. While it's good to be careful, being open to new experiences can enrich your life.