An LED has two prospects: the anode (beneficial) and also the cathode (adverse). It is vital to attach the LED the appropriate way all-around in a circuit—LEDs are polarized components, and reversing the polarity will prevent them from Functioning. The expression 1st appeared while in the English language in 1804. https://www.uk-exhibitionstands.co.uk/product/large-exhibition-stands-design-4/