Community-based services for key populations (MSM, IDU, sex workers) focus on interpersonal, community, and structural interventions. At the interpersonal level, services include peer education, outreach, workshops, and condom/needle distribution. Community services center around drop-in clinics providing testing, treatment, and support groups. Structural interventions advocate for rights, provide alternative incomes, and implement policies like needle exchange. However, major gaps remain in accessing adequate, quality services. Social factors like stigma, discrimination, and restrictive policies also limit service provision and uptake for key populations.