Concept:
In spark ignition engines, ignition must occur at the correct cylinder and at the correct time.
Step 1: The ignition system produces high voltage current for spark generation.
Step 2: This high voltage current must be supplied to different spark plugs in proper sequence.
Step 3: The distributor performs this function.
Step 4: It distributes high voltage current to the engine cylinders according to the firing order.
Step 5: Hence, the device is called the distributor.
\[
\boxed{\text{Distributor}}
\]