Polestar was the performance division of Volvo, similar to amg. Geely(chinese company) bought Volvo 15 years ago and spinned Polestar into its own brand.

Polestar and Volvo still share many things but all Polestar cars are made in China(only some Volvo are made in China), though that is about to change soon.

Generally Polestar is kinda the hip version of Volvo.