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1. *Clothing button* – a small disc or piece of plastic/metal sewn onto fabric. You slip it through a buttonhole to fasten or close a garment. 2. *Hardware button* – a physical switch on a device (phone, machine). Pressing it sends an electrical signal to turn something on/off or change a setting. 3. *Software button* – a graphical element in an app or website (like a "Submit" button). Clicking it triggers an action in the program. 4. *Metaphorical button* – “p