Variable Length Subnet Masking (VLSM) is a technique used in computer networking to create subnets of different sizes within the same network. This allows network administrators to allocate IP addresses more efficiently, ensuring that each subnet has just the right number of addresses for its needs. By using VLSM, organizations can optimize their IP address usage, reducing waste and improving network performance. With VLSM, a single IP address space can be divided into multiple subnets, each with its own subnet mask. This flexibility is particularly useful for organizations with varying requirements, such as a large department needing more addresses than a smaller one. Overall, VLSM enhances network design and management.