An escape sequence in C language is a sequence of characters that doesn't represent itself when used inside string literal or character. It is composed of two or more characters starting with backslash \\. For example: \n represents new line.
Escape Sequence|Meaning
-----|-----
\a|Alarm or Beep
\b|Backspace
\f|Form Feed
\n|New Line
\r|Carriage Return
\t|Horizontal Tab
\v|Vertical Tab
\\\\ |Backslash
\'|Single Quote
\"|Double Quote
\?|Question Mark
\ooo|octal number, where ooo is one to three octal digits (0...7)
\xhh|hexadecimal number, where hh is one or more hexadecimal digits ( 0...9, a...f, A...F )
\0|Null