When cats rub their faces against you, it's called "bunting." This behavior is a way for cats to mark their territory with scent glands located on their cheeks. It’s also a sign of affection and trust, indicating that the cat feels comfortable and safe in your presence.
They lick your hand and rub their head up against your hands
Cats have bald spots in front of their ears because that area is where scent glands are located. When cats rub their faces against objects or people, they are marking their territory with their scent. This behavior can cause the fur to wear away over time, resulting in bald spots.
My cats show their affection when they rub up against my leg
When rocks rub against each other, it is called friction. This rubbing can result in the rocks wearing down over time through a process called abrasion.
Cats rub their head on your face as a way to mark you with their scent. It's a sign of affection and ownership, as they are claiming you as part of their territory. It's also a way for them to show trust and bond with you through scent exchange.
The cat is "marking" you with it's scent, especially if you were near another cat or dog.
When two surfaces rub against each other, it is called friction. Friction is the force that resists the motion of one surface over another.
When cats rub against someone leg they are marking their teritory; so when other cats come along they know that you belong to another cat and then they will rub against you to mark their teritory and so it goes on.Cats also rub your legs to show affection or because they are hungry. My female boss cat only does this when I am standing close to her food bowl or I have lunch meat in hand.
Friction makes things (like soles) rub away
Cats will rub their backs or bodies on you when being petted to transfer its scent onto you.
When solid surfaces rub against each other, this friction is called dry friction. It is the force resisting the relative motion of solid surfaces, such as two objects sliding against each other.
They usually lick where they are dirty or rub up against something to take the dirt off. Dogs are usually not as hygienic as cats.