Software engineering is a field of study related to the design and development of computer programs.

Your computer may be infected with spyware.

My computer got infected with malware.

This freeware is very convenient, and anyone can download it for free.

This software is shareware, so there will be a charge after the trial period.

Do you understand the necessity of this project?

That information is unnecessary.

That information is completely unnecessary.

He thinks that war is a necessary evil.

The trailing edge of this airplane has a very unique shape.