What is the Alt Gr key ?
The AltGr (short for alternate graphic) is a modifier key found on many computer keyboards, especially used in other regions than US and used to type characters that are not widely used in the territory where sold, such as foreign currency symbols, typographic marks and accented letters.
It is typically located to the right of the spacebar and functions similarly to the Alt key on the left side of the keyboard.
When used in combination with other keys, such as letters or symbols, it allows users to type special characters like ₹, €, and more, depending on the specific keyboard layout and language settings.
For an example, if I would like type Indian Rupee (₹) symbol then shortcut is AltGr + 4.
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Press and hold the AltGr key (usually located to the right of the spacebar) and press the key that corresponds to the symbol where the ₹ sign is located.
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If it is not located on your keyboard do not worry, it will still work.
It will only work when you have set the language to English (India) or हिंदी (Hindi).
So in conclusion, using AltGr in combination with another key allows you to access additional characters or symbols that aren’t readily available on the keyboard’s main layout otherwise it is same as other Alt key.