Computer Systems

Operating Systems
An Operating System is a program that runs on a computer. It has different purposes such as: it recognizes input and output devices such as a keyboard and monitor, it runs programs and applications, it keeps files and it controls peripheral devices such as printers. If the Operating System is controlling a large system it helps make sure that different users' work and open programs does not interfere with other users. 


Examples of Operating Systems: Microsoft Corporation, Apple and Google


Firewalls
A Firewall is a block that prevents messages that do not meet the criteria from entering. A Firewall can be put into both Hardware and Software devices. One difference between Hardware Firewall and Software Firewall is that a Firewall is already installed onto a Software device but a Hardware Firewall has to be bought. The functions of a Software Firewall can be altered to the users needs unlike the Hardware Firewall. 

Green Arrows=Good messages
Red Arrows=Bad messages(Virus')


Anti-Virus
An Anti-Virus software is a program that prevents, detects and removes malicious software programs, such as viruses. An Anti-Virus software program is an essential tool for easy, smooth access to the internet. 

These are a list of Anti-Virus software programs:


Malware Protector
Malware is a term used to describe 'Malicious Software'. Malware is any kind of malicious software that is installed without the users authorization. A Malware Protector is a program that destroys malicious software, such as Viruses, Trojan horses and Worms. 

This is the layout of a Malware Protector program.