A dynamo is typically a **DC (Direct Current)** generator. It produces direct current by converting mechanical energy (from a spinning wheel or other moving parts) into electrical energy.
In simple terms, when the dynamo's coil rotates inside a magnetic field, it generates a voltage in one direction, creating DC. However, in some cases, if you add a commutator (a special switch), the dynamo can still produce DC, even though its mechanical structure might look similar to an AC generator.
To summarize, a basic dynamo usually produces **DC**, but if modified (with a commutator), it can maintain that direction of current flow.