In keyboards, Alt is short for Alternative. It refers to a specific key that is present on many keyboards, one which has the letters “Alt” on it. The Alt key is most commonly used in combination with another key. You hold down Alt and press another key. On a Macintosh, the equivalent of Alt is called the Option key.

For example, in Windows, if you hold down the Alt key and while still holding the Alt key down, you then press the Tab key one or more times, you can rotate through various windows on your computer screen.
Alt key
There is another key similar to the Alt key; Alt Gr key (Alt Graph) is used to type alternative characters such as currency symbols and accented letters. For example, AltGr + C = ©.
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