What is website Pv, what is IP, VU, what's the difference?

PV is the total number of page visits. Every time you click or refresh a page, it counts as a PV. The behavior of words with IP can be counted repeatedly. IP is equivalent to a house number. Each computer has a house number, which is used to identify each computer, including external IP and internal IP. The number of IP in the statistical tool is counted according to the number of external IP. VU？ It should be UV, which means independent visitor in Chinese. Each computer is accessed independently, and UV counts the number according to the IP of the intranet.