Why did Tian Fei Netscape Company in Lanzhou recruit people to sign a contract with Xinda Company in Lanzhou?

Employee outsourcing. Lanzhou Xinda Company's employee recruitment is outsourced to Lanzhou Tian Fei Netscape Company, so the person recruited by Lanzhou Tian Fei Netscape Company has to sign a contract with Lanzhou Xinda Company. Outsourcing refers to the dynamic allocation of functions and services of enterprises themselves and other enterprises, and the use of external resources to serve the internal production and operation of enterprises.