Each human has a signature scent - just like fingerprints or DNA, the scent fingerprint is specific to each person and can be used for identification purposes. This odor is a complex mixture of chemicals emitted by the body through sweat, skin oils, and other bodily secretions. Each person’s unique scent fingerprint is influenced by genetics, diet, hygiene practices, health, emotions, stress levels, and even environmental factors.

While humans can't often consciously detect these scent differences, certain animals, particularly dogs, have a highly developed sense of smell and can distinguish between individual human scents. Dogs have 44x the amount of scent cells as humans!) 

Subconsciously, we often pick up on and react to the scent of others, contributing to our overall perceptions of people and our feelings toward them. Similar to how certain scents trigger memories, a person's unique scent can be associated with memories or emotions, potentially explaining why we might find certain people or situations comforting or appealing based on their smell.