Why does a keyboard print the at symbol when using the apostrophe key?

The at symbol (@) appearing when pressing the apostrophe key is typically due to the keyboard layout settings on your computer. For instance, if you're using a keyboard layout that is set to a different language (like a UK layout), the apostrophe key may be mapped to produce the at symbol instead. To resolve this, you can check and adjust your keyboard settings in your operating system to ensure they match your physical keyboard's layout.