The purpose of a job interview includes the following:
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Determine if the organization and job are a good fit for you.
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Expand on information regarding your skills, knowledge, enthusiasm, and personal style.
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Let the employer know the potential value you bring to the organization.
The option "Find out personal things about you" is not generally a purpose of a job interview in a professional context and may even be inappropriate depending on the nature of the questions asked. Interviews should focus on qualifications, skills, and fit for the position rather than personal details unrelated to job performance.