Your public IP address is revealed to every server and website you connect.
DHCP and Static Addresses
While most Internet Server Providers (ISPs) use a DHCP pool for their subscribers, many consumer devices will still retain the same public IP address for weeks or even months at a time.
While VPNs have problems of their own, one of the problems they can be used to solve is that of IP masking, or making it seem as if your traffic is coming from somewhere else. This can be useful to avoid a local ISP’s watching eyes, or even to avoid certain geo-restrictions.