What's modified duration all about?

I understand effective duration (I think) and dollar duration. I see modified duration in problems, but it seems always to be a distractor. Is there ever a reason to consider modified duration, or is it safe to ignore it?

reason is modified doesnt considers convexity AFAIK

What’s AFAIK?

its like IMHO

modified duration assumes yield change does not change expected cash flows. effective duration accounts for any expected cash flow changes.