Hello World in assembly!

hello_world.asm

section .data
    hello db 'Hello, World!',0

section .text
    global _start

_start:
    ; write the string to stdout
    mov eax, 4         ; system call number for sys_write
    mov ebx, 1         ; file descriptor 1 is stdout
    mov ecx, hello     ; pointer to the string
    mov edx, 13        ; length of the string
    int 0x80           ; call kernel

    ; exit the program
    mov eax, 1         ; system call number for sys_exit
    xor ebx, ebx       ; exit code 0
    int 0x80           ; call kernel