What's the difference between "dia" and "ia"?
I think both mean "he" and "she" but "dia" is formal and "ia" is informal.
If I ever go to Indonesia, I always intend to use dia.
the letter D, otherwise nothing.
Dia means she/her/he/him and ia can mean she/her/he/him but can also mean is/it.
Yes, you are right.
There are more differences, here is a topic about this subject:
"ia" & "dia" , "Basics 2", Tips & Notes, Addendum.