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In addition, a Masters in Social Work (MSW) is a very versatile degree which can be used as a stepping stool for other career tracks including public health and policy. Most entry-level positions require a Bachelor of Social Work (BSW). An MSW is necessary for other positions, including that of clinical social worker.
You do not need an undergraduate degree in social work to be admitted to an M.S.W. program. You must have a bachelor's degree from an accredited college or be close to graduating when you apply. Many graduate programs have an option for applicants who already have a bachelor's degree in social work.