What does 'Tweak' Event Mapping refers to?

I was looking for the shortcut for the Spin Tool, and I see it is set to Tweak, Left, Any by default in 2.8.
I know I can set it to whatever I want, but I was wondering what this ‘tweak event’ means. As google did not help this time, I’m asking here.

It refers to a click and drag action.
It is the choice for gizmos of active tools and Box Select, Lasso Select, etc…

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