Hello guys, my graphic is asking for a vectorized file, he asks for PDF file but then says is not vectorized

What does Vectorized mean?
To vectorize, can we select the whole Frame in Figma and press on Outline Stroke?
Or shall we run the “Vectorize” Plugin on the frame?
If every single part in the project results as Vector, is that done?
Can I export as a PDF and it will be saved as vector?