Another classification of Computer System:
Hardware+Software = Computer System
Hardware are the physical components of computer.
Software is the collection of programs working for a specific purpose.
Program is a set of instructions given to computer to do a particular work.
2 types of software:
System Software
Application Software
System Software is the necessary software that provides an environment to enable application software to work or the user can communicate with system.
Eg: Operating system, Language Translators (Eg: Compilers, Interpreters, Assemblers)
Example of Operating Systems: Windows XP, Windows 7, Linux, Mac etc.
Application Software is useful for specific kind of work.
Eg: Word, Photoshop, AutoCAD, games etc.
Virus: Virus is an application software that causes other software to not function. It is not biological virus or any living thing but got the name by having the characteristics of biological virus.
Different types of viruses: Worms, Trojan Horses, Logic Bombs etc.
Precautions to be taken:
- Install and keep uptodate an Anti-Virus Software
- Don’t share Pendrives or scan them before opening
- Scan before open any memory device that has been brought from outside.
- Don’t open unknown e-mail messages.
Some popular Anti-Virus Software Vendors: Norton, Quick Heal, Comodo, Essel