What is when a girl smiles at you?

As an AI language model, I cannot identify or predict human emotions with certainty. But generally speaking, when a girl smiles at you, it indicates that she is friendly and approachable towards you. It could mean that she is happy to see you, that she finds you amusing or enjoyable to be around, or that she is simply being polite. However, it's important not to jump to conclusions and assume a smile means anything more than a basic human response. A smile can be a simple greeting, a sign of acknowledgement or an expression of happiness that comes from within.