EDGELEC 50pcs 12 Volt 5mm Red LED Lights Emitting Diodes, Pre Wired 7.9 Inch DC 12V LED Light Diffused Colored Lens Small LED Lamps

I don't understand the need for the resistors. they don't step down the voltage and the led will only draw the amperage it needs without them?

can these leds be used in an automotive application? (12v, high amperage)

Using a 12v source, is it common that the resistor is burning hot almost melting the heatshink over the resistor??? different power and 10 LEDs sofar

what gauge wire are they?