What is Open RAN?

Hey ,we heard more about open RAN.but what it is can any one explain.

Hi,

This is a nice video to Open RAN Overview | OpenRAN | O-RAN | OpenRAN | O-RAN | TIP | P-RAN Alliance | Cu | DU RU | O-CU | O-DU | O-RU | RIC | nRT RIC | SON