hi everyone i am new to arduino i want to know the name of the development board of arduino uno can anyone tell me

Umm...the Arduino Uno?

I mean - that -is- the development board; the on-board microcontroller is the ATMega328 - think of the Arduino Uno as a "carrier/development board" for the Atmel ATMega328, and you should be able to understand things better.

I hope...?