What is the meaning of "post" or "position" in office?I think post or position in office is job or appoinment but confusion is that job and...

When we refer to the post or the position that a person
holds, we are referring to their job.  We would say that Barack Obama holds the
post of President of the US.  We would say that that is his
position.

Some people get
their positions through
appointment.  A prime minister, for example, might appoint
someone else to the post of foreign minister or defense
minister.  In American English, at least, it would be odd to use
appointment and post in
similar ways.  We would say "his job is foreign minister"
or "his post is foreign minister" but we would not
typically say "his appointment is foreign
minister."

In the link below, you can see an example of the
term "post" at the start of the 4th paragraph.