Unlike LTE, 5G NR has multiple subcarrier spacing. These subcarrier spacings are indicated by numerology. Usually, we are in doubt that why 5G NR has multiple numerologies and how should we pick one for a particular application.
This video explains the logic of having multiple numerologies and how to choose one for a particular application in 5G NR.

5G NR Physical Layer Concepts
Playlist:    • 5G NR Physical Layer | Chapter 1| Num...  

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