A subnet is a subdivision of an IP network, which separates the network into smaller pieces that are easier to manage and control. There are several synonyms for the word subnet, including subnetwork, network segment, network address, network band, and network zone. Each of these terms describes a portion of a larger network that is partitioned into smaller segments, each with its own unique IP address range and routing rules. Subnets are often used by businesses and organizations to create separate networks for different departments or functional areas, which can improve network performance and security. Whatever term you use, subnets are an essential part of modern networking technology.