Because that's their way of telling you that they are comfortable around you. For example, if you scratch them under the chin, they will like it and will start to purr.
Cat's can purr for many reasons, being content or being in pain.
purrs ex."A cat purrs."
A cat purrs when it is happy or is feeling safe.
"The siamese cat purrs softly when stroked," combines these sentences. Alternately, you could say,"The cat is a siamese and purrs softly when stroked."
no is just means it is being loved. like when my cat gets a scratch he purrs. it just shows how much the cat loves you.
When a cat is happy, it usually purrs or sways its tail.
Cat purrs can be good for you. Just like when you smile, the sound of a cat purr can bring you joy. The sound of a cat purr also lowers your stress levels, therefore making cat purring a medical and mental benefit.
A cat purrs when it is happy. The opposite could be "growls" (the same kind of sound) or "hisses" (also expresses anger).
A cat meows or purrs, but mostly meows. A car only purrs when it's being patted of something. Cats also hiss when thier mad or in a fight. Hope it helped :)
It is accepted that a Happy cat purrs like a happy dog wags his tail.
scraching,hissing,meows,purrs,and biting
It means that the cat is purring very loudly, like a boat's motor.
This is called a "purring" sound.The cat purrs.