What is back slash?

A backslash is a character () commonly used as an escape character in computer programming languages and in operating systems. It is used to indicate that the character that follows it has a special meaning, usually within strings or regular expressions.

In Windows operating systems, the backslash is used as a path separator in file paths, while in UNIX-based systems, it is typically used as an escape character or command line options.

In HTML, the backslash can be used as an entity reference to display special characters, such as the copyright symbol ©.

When typing on a computer keyboard, the backslash is located on the same key as the question mark and can be accessed by holding the shift key while pressing the key.