Herbal medicine means using plants (like the ones you see outside or in the garden) to make medicine or treatment for different health problems.
Just like how you eat fruits and vegetables for a healthy body, some people use different plants to feel better when they get sick, or to help prevent illnesses.
For example, some people drink tea made from ginger to help with nausea or upset stomach, or use aloe vera on a cut or burn to soothe the skin.
Herbal medicine has been used by people for many many years, even before doctors started prescribing pills or medicine you can find in a pharmacy. People still use herbal medicine today, but it is important to talk to a doctor or healthcare provider before trying any new kind of treatment.