bugs and viruses

[Matrix01]

are bugs and viruses same?

[lisati]

It depends on who you talk to. A "web bug" can be a form of spyware (http://en.wikipedia.org/wiki/Spyware), and a virus is a form of malware (http://en.wikipedia.org/wiki/Malware).

[Copper Bezel]

True, but don't confuse matters with a simple question. = )

Bugs (http://en.wikipedia.org/wiki/Computer_bug) refer to glitches in software due to accidents or unexpected behaviors. Viruses are a particular type of malware. Malware (http://en.wikipedia.org/wiki/Malware) in general is any code or program written for malicious reasons, such as to steal your data or damage your system.

For questions like this, start with a little Google searching, or take a look at the Wikipedia entries.