Every computers need at least one anti-virus, but how anti-virus can protect computers?

Why us need a computer protection? you all know why? i trusted that you all know why right? is about to keep our computers in a good conditon and still can in a good performance.

But how? it is easy ways to protect your computers from virus or spyware. whats that? it is of course anti-virus and anti-spyware. But what suitable types of anti-virus and anti-spyware for your computers? you all know?

Every types of anti-virus in the world have a one same function. That is to keep your computer from virus. Also, anti-spyware to keep your computer from spyware. For me, every types of anti-virus and anti-spyware is suitable for every computers.

What i want to advise you all is one computer need one anti-virus software only. Don't put over than one anti-virus software to your computer. it will put your computer in a low performance. For one computer, one anti-virus software, one anti-spyware software and firewall only to ensuring your computer in a good performance.