Your ultimate purpose is to get a job, but the purpose of a CV is to convey why you want and are qualified for a particular job. Furthermore, since the CV communicates the substance of your experiences and accomplishments, its main purpose is to demonstrate the relevance of the course of your academic life to the position you seek.
For example, are you applying for a research position at a university? If so, your CV should emphasize your research experiences, interests and publications. Are you applying for a university professor position? If so, your CV will emphasize your teaching experiences and academic interest.