1. categories
1.1. open source
1.1.1. created by unpaid volinteers, begin to gain wide acceptance among computer users
1.1.2. freely
1.2. proprietry
1.2.1. privately owned and limited to a specific vendor/ computer model
1.2.2. license/ paid
2. System Software
2.1. operating system
2.1.1. an OS a set of programs containing instructions that work together to coordinate all the activities among computer hardware resources
2.1.1.1. Stand-alone
2.1.1.1.1. use for works on a desktop computer, netbook computer/ mobile computing device
2.1.1.2. server
2.1.1.2.1. designed specifially to support network
2.1.1.3. embedded
2.1.1.3.1. use for mobile device or concume electronic device
2.2. Utility program
2.2.1. an OS that allows a user to perform maintenance-type task
2.2.1.1. File manager
2.2.1.1.1. to provide routine file management tasks
2.2.1.2. Disk Cleanup
2.2.1.2.1. to searches and remove unnecessary files
2.2.1.3. File compression tools
2.2.1.3.1. to shrinks the size of a files
2.2.1.4. Anti-virus Program
2.2.1.4.1. to protects a computer against viruses by identfying and removing computer viruses found in memory
2.2.1.5. spyware remover
2.2.1.5.1. to detects and deletes spyware
2.2.1.6. Disk defragmentar
2.2.1.6.1. to organizes the files and unused space on computer hard disk
2.2.1.7. Backup and restore utility
2.2.1.7.1. allows users to copy files to another storage medium in case of damage or lost
2.3. Application software
2.3.1. definition: concists of programs designedto makeusers more productive and/or assist with personal task
2.3.2. type
2.3.2.1. web browser
2.3.2.1.1. allow users to access and view web pages
2.3.2.2. word processing
2.3.2.2.1. allows users to create and manipulate documents
2.3.2.3. spreadsheet
2.3.2.3.1. allow users to organize data in rows and columns and perform calculations
2.3.2.4. database
2.3.2.4.1. a collection of data organized in a manner that allows access, retrieval and use of that data
2.3.2.5. presentation
2.3.2.5.1. to create visual aids for presentating