Semiology is the idea of a general study of the sign systems which make up our societies.
Semiology is the study of signifying practice; analysis of the inscription of meanings in culture.
Semiology is a study concerned with distinguishing the location of the signs, to define what constitutes them as signs, and to know how and by what laws they are linked.
Semiology is differentiated from structuralism in that semiology is often reserved for his work on sign systems, whereas structuralism is more frequently employed in his analysis of literary narratives.
Semiology's aim is no longer merely to reverse (or to correct) the mythic message, putting it right side up, with denotation at the bottom and connotation at the top, nature on the surface and class interest deep down, but to change the object itself.