Final answer:
Venipuncture is the process of withdrawing blood from a vein using a needle and collecting tube. It is performed by phlebotomists and is used for medical analysis and other purposes.
Step-by-step explanation:
Withdrawing blood from a vein using a needle and collecting tube is known as venipuncture and is performed by phlebotomists. They use a needle to puncture a vein, typically in the arm, and collect the blood into a tube. This procedure is commonly done for medical analysis, transfusions, donations, or research purposes. After collection, the blood may be analyzed in medical laboratories.