What's the “accent color”?

Question

Either my English is not good enough or I just do not get it, but could anybody please explain to me what the \"accent color\" is and where it is used?

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My ques

Answer 1

You got good example in Material Design docs -> your palettes are shown in section "UI color application" - with blue colors being primary and pink being used for accents.

Here is what it means in practice (also FAB would most likely use pink background color)