What does outsourcing mean? Saw it in Lenovo’s recruitment·

They are not officially Lenovo employees. And you are considered an employee of a labor outsourcing company. For example, it's like the beer promoters selling beer at the food stalls. In fact, they have no labor relationship with the food stalls, and their wages are paid by the brewery. The quality of the food stall's business has nothing to do with them except for the beer.