There are different kinds of diodes.  Diodes control the flow of electricity in one direction.

The positive side is called the anode and the negative side is called the cathode.  Currently can only flow from the anode toward the cathode.  The grey band shows the side that is the anode (+).

For this reason, it is very important that all diodes, including LEDs, are soldered on correctly, in the right direction.

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