I know the question of what is a symmetric monoidal category has shown up here.

I was wondering if there was a more informal way of describing a symmetric monoidal $(\infty, n)$-category as a "sequence" of symmetric monoidal categories.

Or perhaps is there a notion of a strict monoidal functor between strict monoidal $n$-categories? If so, can we somehow take this definition and "weaken" in to arrive at an informal definition?

Lastly, if either above are affirmative, can we then describe a symmetric monoidal functor between them in an informal way?