olemus
(1a) tavaline valge koolitahvel
https://duckduckgo.com/?q=whiteboard&t=h_&iax=images&ia=images

https://en.wikipedia.org/wiki/Whiteboard

(1b) tahvli otstarvet täitev interaktiivne ala kuval
mõnedes rühmatarkvara- ja konverentsisüsteemides
https://en.wikipedia.org/wiki/Whiteboarding

Wiktionary:
1. a writing board finished with a hard white material, which can be written upon using special non-permanent markers and subsequently wiped clean
2. (by extension, computing) a collaborative tool allowing several users to write and draw on the same shared display

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