A Public IP Address is a unique identifier assigned to a device connected to the internet. It allows devices to communicate with each other over the web. Public IP addresses are assigned by the Internet Assigned Numbers Authority (IANA) and can be either static (permanent) or dynamic (changing periodically). These addresses are essential for routing internet traffic, enabling users to access websites and online services. Each public IP address is visible to the outside world, making it possible for servers to identify and respond to requests from different devices. This visibility is crucial for activities like web browsing and online gaming.