function of bootloader

[Bhuvanesh123]

" bootloader helps to run run arduino code without any external hardware"
i started to learn about microcontroller only by arduino.so wat it mean external hardware.are we using bootloader to burn the code.what is the function of bootloader.please help me

 

[HTA]

A bootloader stores the program to be execute after power-on. To boot a computer means to load the program into a program memory(usual a read/write memory). To do this function a bootloader program does it after power-on. External hardware means that memory devices(like EEPROM/FLash/ROM or a disc drive) are connected to the Arduino. I guess you are working on your PC to develop programs for the Arduino and then download them into the A-hardware connected through USB. To have this program automatically loaded after power-on it must be programmed into the bootloader. The complete process is described here: https://arduino.cc/en/Hacking/Bootloader?from=Main.Bootloader . If it is programmed into the bootloader the Arduino executes this program after power-on.

Enjoy your design work!