LEDs can be monochromatic or polychromatic. Indeed, there are many types of LEDs. Before going though some examples, let's discover some of these LED types.
Usually, LEDs are used both to block the current coming from a line to its cathode leg and to give light feedback when the current goes into its anode:
The different models that we can find are as follows:
We will only talk about basic LEDs here. By the term "basic", I mean an LED with discrete components like the one in the preceding image.
The package can vary from two-legged components with a molded epoxy-like lens at the top, to surface components that provide many connectors, as shown in the following screenshot:
We can also sort them, using their light's color characteristics, into:
Monochromatic LEDs
Polychromatic LEDs...