What is the difference between the secretary & admin assistant on basis of job role?

A secretary job is just to do typing of the document exactly as it comes ; whereas the administrative assistant is responsible of writing/developing the letter.

Secretarial and Administrative Asst job role is almost the same, but then Secretary is most likely assisting the Upper management particularly (Executive/Manager) while the Administrative Assistant handling the coordination within the entire management as support to every departments within the office.

Though most people think secretary and administrative assistant are the same, they are actually two different jobs. A secretary is purely clerical work whilst an  administrative assistant can make decisions and are even delegated or entrusted to handle some projects. An administrative assistant arranges meetings and conferences, manages his superior's calendar, and may review and filter memos, reports and the like.