Elaborate section 2(f), 2(g) and 2(h) of Cr.P.C ?

Ans:   Section 2(f), 2(g) and 2(h) of Cr.P.C.  

inquiry” means every inquiry, other than a trial, conducted under this Code by a Magistrate or Court;

“investigation” includes all the proceedings under this Code for the collection of evidence conducted by a police officer or by any person (other than a Magistrate) who is authorised by a Magistrate in this behalf;

“judicial proceeding” includes any proceeding in the course of which evidence is or may be legally taken on oath;