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