Working of UART Communication

I am reading Uart communication but I do not know whether my concept is right or wrong If something is wrong then please correct me. Uart is use to send/receive data between two devices. let's suppose If i want to send/ receive data from Micro-controller to LCD, Then I can send/receive data using Uart.

My efforts :
I am following this links to understand basic working of uart
https://en.wikipedia.org/wiki/Universal_asynchronous_receiver-transmitter...

Working of UART Communication