Magic Bytes

File Format	Magic Bytes	ASCII representation
PNG image file	89 50 4E 47 0D 0A 1A 0A	%PNG
GIF image file	47 49 46 38	GIF8
Windows and DOS executables	4D 5A	MZ
Linux ELF executables	7F 45 4C 46	.ELF
MP3 audio file	49 44 33	ID3