A social worker is a trained professional who works to improve the well-being and quality of life of individuals, families, and communities. They provide various forms of support, guidance, and advocacy to people who are facing challenges, crises, or difficult life situations. Social workers are found in a wide range of settings, including schools, hospitals, mental health clinics, government agencies, non-profit organizations, and more.

The roles and responsibilities of social workers can vary depending on their specialization and the context in which they work. Some common tasks and functions of social workers include:

1. Counseling and Emotional Support: Social workers often provide emotional support and counseling to individuals and families dealing with issues such as mental health challenges, grief, trauma, addiction, and relationship problems.
2. Case Management: Social workers help individuals navigate complex systems and access resources such as healthcare, housing, education, and social services. They assess needs, develop plans, and coordinate services to ensure clients receive appropriate assistance.
3. Advocacy: Social workers are advocates for the rights and well-being of their clients. They may lobby for policy changes, work to secure benefits, or address systemic issues that impact their clients' lives.
4. Child Welfare: Social workers in child welfare focus on ensuring the safety and well-being of children and families. They assess situations where children may be at risk, intervene in cases of abuse or neglect, and work to reunite families or find suitable placements for children when necessary.
5. Medical and Healthcare: Medical social workers work in hospitals and medical settings, assisting patients and families in dealing with the social and emotional challenges of illness, injury, and medical treatments.
6. Schools and Education: School social workers provide support to students, families, and teachers to address academic, behavioral, and emotional challenges. They also connect families with community resources and services.
7. Gerontology: Social workers specializing in gerontology work with older adults and their families to address issues related to aging, long-term care, and end-of-life planning.
8. Substance Abuse and Addiction: Social workers specializing in substance abuse help individuals and families affected by addiction by providing counseling, support, and resources to overcome challenges related to substance use.
9. Criminal Justice: Criminal justice social workers work with individuals who are involved in the criminal justice system, helping them reintegrate into society after incarceration, providing support to families affected by incarceration, and addressing the underlying causes of criminal behavior.
10. Community Development: Social workers engaged in community development work to enhance the overall well-being of communities. They collaborate with residents, organizations, and government agencies to address issues like poverty, housing, and social inequality.

To become a social worker, individuals typically need a degree in social work (such as a Bachelor's or Master's degree) and often need to be licensed or certified by their state or country. The field of social work is guided by ethical principles that prioritize client well-being, respect for diversity, and social justice.