This is true not just in geometry but in every field of knowledge. You can define complicated concepts in terms of simpler ones, and those simpler ones in still simpler ones and so on. However, you will end up with a few terms which cannot be defined in terms of simpler concepts (without going into a circular definition). These terms must remain undefined.
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The three undefined terms are the point,the line and the plane.
A point, line and plane
the "building blocks" of geometry(which are the point,line and plane)are so-called undefined because, technically,they can't be described without the aid of words which are undefined themselves.
the "building blocks" of geometry(which are the point,line and plane)are so-called undefined because, technically,they can't be described without the aid of words which are undefined themselves.
Point, line, and plane