Question

Can anyone tell me what is frame of reference?

Answer 1

a set of criteria or stated values in relation to which measurements or judgements can be made.

"the observer interprets what he sees in terms of his own cultural frame of reference"

a system of geometric axes in relation to which measurements of size, position, or motion can be made.

noun: frame; plural noun: frames; noun: reference frame; plural noun: reference frames

Answer 2

 frames of reference move relative to one another. Simply put, when you are standing on the ground, that is your frame of reference