What is VLAN and Why VLAN?

Today my topic is VLAN, and why we need VLAN.
VLAN stands for Virtual Local Area Network. VLAN is a logical network that can group devices /users regardless of their different physical locations. A VLAN is created at the switch.
Why VLAN? There are many reasons why we need VLANs. In this video, I will talk about 3 reasons: 1) Segmentation 2) simplicity of network design and deployment 3) simpler troubleshooting and management.
My whole playlists:
https://www.youtube.com/user/sunnylearning/playlists
Related Playlists
Virtualization, VLAN, Trunking, inter-VLAN
https://www.youtube.com/playlist?list=PLSNNzog5eydurp2zcB4xs6gdeeVW3cMOW&playnext=1&index=1&disable_polymer=true
Switching and Routing
https://www.youtube.com/watch?v=ck3gx9HB9-k&list=PLSNNzog5eydtmcbcbc1b8pVRkgre3vNUy
Ethernet Basics
https://www.youtube.com/playlist?list=PLSNNzog5eydvAxPHJiDybPomC1fFHf1KE .