More about Frame of reference
We know that we need a frame of reference is needed to locate the position of any object. For that we choose rectangular coordinate
system
of three mutually perpendicular axis that are $x$, $y$ and $z$ axis. The point of intersection of these three axes is called
Origin 'O'
and is considered as the
Reference Point.
The $x$, $y$ and $z$ coordinates describe the position of object with respect to the coordinate system.
To measure time , we need a clock.
The coordinate system along with a clock constitutes a
Frame of reference.
So , the frame of reference is a coordinate
system , with a clock w.r.t. which, an observer can describe the position, displacement etc. of an object.
Frames of reference are of two types:

Inertial frame of reference: These are the frame of reference in which Newton's First law of Motion is applicable.
NonInertial frame of reference: These are the frame of reference in which , Newton's first law of motion is not applicable