Lightning strike. A lightning strike is an electric discharge between the atmosphere and an earth-bound object. They mostly originate in a cumulonimbus cloud and terminate on the ground, called cloud to ground (CG) lightning.
Virus protection software is designed to prevent viruses, worms and Trojan horses from getting onto a computer as well as remove any malicious software code that has already infected a computer. Most virus protection utilities now bundle anti-spyware and anti-malware capabilities to go along with anti-virus protection.
Anti-virus software protects your computer from viruses that can destroy your data, slow down or crash your computer, or allow spammers to send email through your account. Anti-virus protection scans your computer and your incoming email for viruses, and then deletes them. firewall is a software program or piece of hardware that blocks hackers from entering and using your computer. Hackers search the Internet the way some telemarketers automatically dial random phone numbers. They send out pings (calls) to thousands of computers and wait for responses.