Car Battery Charger - what is "start" for/

I have a battery charger w a switch that has "start" and "charge" What is the start for? Is it when you hook it to the battery for a instant start?

I have a battery charger w a switch that has "start" and "charge" What is the start for? Is it when you hook it to the battery for a instant start?

Usually just higher amperage for starting. Most chargers label how much. You still have to turn the key.