LCD (Liquid Crystal Display )
LCDs like these are very popular and broadly used in electronics projects as they are good for displaying information like sensors data from your project.
The 16x2 LCD has a total of 16 pins. As shown, eight of the pins are data lines (pins 7-14), two are for power and ground (pins 1 and 16), three are used to control the operation of LCD (pins 4-6), and one is used to adjust the LCD screen brightness (pin 3). The remaining two pins (15 and 16) power the backlight.
As seen in the Picture, If you use LCD with 16 pins, you have to make at least 12 connections. But IC2 module make it more easer.
LDC and IC2 module
Wiring an I2C LCD is a lot easier than connecting a standard LCD. You only need to connect 4 pins instead of 12.