Malware is stands for "malicious software." It is designed to crawl into a computer without the user's permission. The term "malware" is an umbrella term that comprises many different types of hostile and intrusive software programs.

Types
Malware contains viruses, worms, spyware, keystroke loggers, crime ware, Trojan horses and any other software that the user did not ready to install.

Purpose
A malware virus can have lots of targets. Some are annoying but harmless pranks, while others aim to develop the virus sender by stealing secret information from the computer.

Symptoms
You may get open symptoms of malware such as search engine redirects and continuous pop-up advertisements, or you may observe more delicate effects, like a very slow computer's performance.

Warnings
Only open email attachments from trusted sources. Keep your OS current, also install security patch updates.

Prevention
Install antivirus and malware protection on your system. And scan your system then quarantine or delete suspected threats. Make sure that that your email program is set up to run real-time scans.