Explanation

In English, there are 44 phonemes, or word sounds that make up the language

Explanation

A trackball is a computer cursor control device used in many notebook and laptop computers.

Trackball is just like a Mouse. 

Explanation

Smallpox is caused by the variola virus. The virus can spread: Directly from person to person

Explanation

• Touchpad is also called Track-pad.
• A touch pad is a device for pointing (alternative to the mouse).

Explanation

• DVD is an optical disk technology with a  4 to 5 gigabytes storage for videos, audio or other information.
• DVD stands for Digital Versatile Disk.
  
• DVD is an example of Optical Disk. 
• DVD is a storage device.

Explanation

• Sound card also known as an Audio Card is an internal expansion card facilitates the input and output of audio signals to and from computer.

• A sound card is an internal expansion card that provides input and output of audio signals to and from a computer under the control of computer programs.