The source of light is quite essential for human beings. In ancient times, from drilling wood for a fire, torches, oil lamps, candles, to Edison's invention of the electric bulb, to fluorescent lamps, LED lights, and special lighting.
The IP level is composed of two numbers. The first number means dustproof. The second number means waterproof, the largest the number, the better the protection level.
The rope light looks like a rope, it will be stored or sold roll by roll, but the length depends on your own needs.
The strip light is material SMD led, PCB, resistance, 3M tape, wires, and sometimes with IC.