For different network devices to communicate they need two means (physical and logical), the physical part is an Ethernet cable and the logical part are the VLANs. Imagine that the logical part is a highway, so if this highway does not have marked lines between the lanes this will cause a circulation problem between the cars because they do not have a defined traffic guide. When we put lines between the different lanes, these would be the VLANs, if we realize this will allow free transit, greater order and greater traffic control. In conclusion, in data networks VLANs allow us to separate data traffic between different groups of network devices allowing us to communicate more effectively between them.
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