Circuit and black glue-ish thing

Hello,

I was watching some Youtube videos and a guy showed this esc:

https://i.imgur.com/3bYo8mK.png

(Edited)

The strange thing that I noticed is the black glue-ish thing on the board.

what is that?

Thanks

Please not a discourse link. Post the image here according to the forum protocol.

It is called 'potting compound'.

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