Note on Preface and Foreword;
If it is your book and your own introduction or the editor’s intro, it is called ‘preface’. Just think Rohit’s mother went into the shoes of Rohit in 1980s and told about her son. She used to give interesting intros.
If it is your book and you ask the next door uncle or a known person to write an intro, then it is called ‘foreword.’