Which component connects a keyboard to a computer?

The component that connects a keyboard to a computer is indeed a USB connection or a wireless signal. USB connections are the most common type used in modern keyboards, allowing for both data transfer and power supply directly to the keyboard from the computer.

Wireless keyboards operate using radio signals or Bluetooth technology, which eliminates the need for a physical cable and provides more mobility for the user. This flexibility in connectivity is essential for user convenience, making it easy to connect and disconnect without dealing with wires.

The other options such as HDMI cables, Ethernet cables, and VGA connectors are designed for different purposes. HDMI is primarily used for transmitting high-definition video and audio, Ethernet cables are for networking and internet connections, and VGA connectors are for video output to displays. None of these are suitable for connecting a keyboard, highlighting the specific role that USB connections and wireless signals play in linking keyboards to computers.