Arduino Uno is a microcontroller board based on Atmega328. There are 16 digital I/O pins (6 of them are PWM out), 6 analog input pins, a 16 MHz crystal oscilator, an USB socket, a power socket, an ICSP connector and reset button on the board. There are the all essential parts on the board for microcontroller operations.
D44780 compatible LCD Characters Display 16×02 green color, 5V operating voltage. Dimension of the module is 80 x 36 x 13.5 mm. Take note, the picture is for reference only, LCD pcb design may have slightly difference, but the display functionality and pinout are same!