Starting From Booting

1. Turn on system.

2. Sends electronic signal to attached device and record their response in a file.

3. Select bootable partition.

4. Now grub loaded and other process is going

i. initramfs :- it is sudo file system require to kernel is minimal filesystem which is stored in ROM.

ii. vmlinuz :- it is actual kernel.

iii. :- it contain system call and kernel exported symbols.