Benefits of VLAN :

Assume we have three VLANs:

For Faculty- VLAN 10

For Student-  VLAN 20

For Guest- VLAN 30

There are several benefits of VLAN mentioned below :

Security – Groups that have sensitive data are separated from the rest of the network, decreasing the chances of confidential information breaches. Faculty computers are on VLAN 10 and completely separated from student and guest data traffic.
Cost reduction – Cost savings result from less need for expensive network upgrades and more efficient use of existing bandwidth and uplinks.
Higher performance – Dividing flat Layer 2 networks into multiple logical workgroups (broadcast domains) reduces unnecessary traffic on the network and boosts performance.
Broadcast storm mitigation – Dividing a network into VLANs reduces the number of devices that may participate in a broadcast storm.  LAN segmentation prevents a broadcast storm from propagating to the whole network.

Improved IT staff efficiency – VLANs make it easier to manage the network because users with similar network requirements share the same VLAN. When we provision a new switch, all the policies and procedures already configured for the particular VLAN are implemented when the ports are assigned. It is also easy for the IT staff to identify the function of a VLAN by giving it an appropriate name.
Simpler project or application management – VLANs aggregate users and network devices to support business or geographic requirements. Having separate functions makes managing a project or working with a specialized application easier, for example, an e-learning development platform for faculty. It is also easier to determine the scope of the effects of upgrading network services.