Why do we carry out Quality Control and fall which process group?

thanks for invition ,,,,,,,,,, i agree with experts answers

Perform quality control gives  the opportunity to apply measuring and statistical tools to measure the effectiveness of the project team, the deliverables, and the overall level of customer satisfaction on the project. Also note that the key output: Validated Deliverables. This means that the deliverable has been validated against the customer’s specifications.

Falls in Monitoring and controlling process group

to be sure that product is according to what it should be in terms of quality.

it is in controlling and monitoring process group according to PMbok 5,