Can you explain the concept of VLSM?

Variable Length Subnet Masking (VLSM) is a subnetting method that allows the division of an IP address space into subnets of varying sizes based on specific needs. This technique maximizes IP address utilization by assigning different subnet masks to different subnets, accommodating networks of different sizes without wasting addresses. VLSM enables more efficient routing and better management of IP addresses, particularly in complex networks where requirements can vary significantly.