An LED has two leads: the anode (beneficial) and also the cathode (detrimental). It is essential to connect the LED the best way all-around within a circuit—LEDs are polarized parts, and reversing the polarity will prevent them from Doing the job. The phrase 1st appeared in the English language in https://www.uk-exhibitionstands.co.uk/product/led-backlit-display-3ft/