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Social work is a diverse field, so the job really depends on what what you decide to specialize in. For example, social workers can work in hospitals, schools, well-fare agencies, clinics, or private practices. Some work with addiction, emotional health, or issues of social welfare. This website has a really good overview of the field: http://www.bls.gov/ooh/community-and-social-service/social-workers.htm
In terms of a "day in the life," I would highly recommend shadowing a social worker (or a few social workers in different sub-fields if you haven't quite decided what you want to specialize in) to really acquaint yourself with type of work you could look forward to doing. Job shadowing gives you a rare glimpse into the real-life challenges, demands, and rewards of a career before you commit your future to it.
If you're currently enrolled in a college or university, you can contact the academic advisor for your school's social program, or even reach out to your school's career advisor for more information and specifics :)