-ing is used for verbs (actions) in the present tense, yes. “He is painting”. But it is also used to make nouns (*things*) from verbs.
> Used to form nouns or noun-like words (or elements of noun phrases) from verbs, denoting the act of doing something, an action, or **the embodiment of an action**.
There are other examples – drawing, booking, viewing, hearing, etc.
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