It is a form of communication and it can mean many different things. He/She may just want to sit in your lap, or get some attention, but they may want you to go feed them. They are usually just showing their affection.
Because they are happy
because of course that's how their made.
There emotion is very happy and lovable so they are happy
usually they pur and rub their fur against you
Pur is not a word.
Viva felice pur
Lohar-pur Mahmood-pur Laha-war
The population of Siras Pur is 14,558.
Dayal Pur's population is 12,994.
The population of Gokal Pur is 90,564.
Saadat Pur's population is 1,000.
The population of Ziauddin Pur is 48,028.
The population of Jiwan Pur is 20,765.