A 20x2 LCD means it can display 20 characters per line and there are 2 such lines. In this LCD each character is displayed in a 5x7 pixel matrix. Black text on a green background, Connection port is 0.1" pitch, Single row for easy breadboarding and wiring. Pins are documented on the back of the LCD to assist in wiring it up. Single LED backlight included can be dimmed easily with a resistor or PWM and uses much less power than LCD with EL (electroluminescent) backlights. Can be fully controlled with only 6 digital lines. The built-in character set supports most English/European/Japanese text, see the HD44780 datasheet for the full character set Up to 8 extra characters can be created for custom glyphs or foreign language support