When cats rub against you, it is a sign of affection and a way for them to mark you as theirs. Here are some reasons why cats rub against people:

• Affection: Rubbing against you is a way for cats to show that they feel safe and secure with you. It is also a way for them to seek attention and affection from you.

• Marking territory: Cats use scent to communicate, and rubbing against you is a way for them to mark you as theirs. They have scent glands on their cheeks and chin that release friendly pheromones, which they use to mark their territory and signal to other cats that you belong to them.

• Greeting: Rubbing against you can also be a way for cats to greet you and say hello.

• Information gathering: Cats rely heavily on their sense of smell, and rubbing against you can be a way for them to pick up scents from your day and gather information about you.

Overall, when a cat rubs against you, it is a sign that they trust you and feel comfortable around you. It is a way for them to show affection, mark their territory, and communicate with you using scent.