Why is an IP address used in networking?

An IP address is a unique numerical label assigned to every device connected to a computer network that uses the Internet Protocol for communication. Its primary function is to identify each device uniquely, allowing data packets to be routed correctly from a source to a specific destination. Without unique identifiers like IP addresses, network devices would not know where to send information, making communication impossible. Option A is incorrect because an IP address does not inherently boost performance; it merely facilitates routing. Similarly, Options C and D are incorrect because installing applications or saving documents relies on storage hardware and operating systems, not network addressing. Therefore, the correct answer is Option B, as unique identification is the fundamental purpose of an IP address in networking.