Software Classification (AQA GCSE Computer Science): Flashcards
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Two main categories of software
Two main categories of software
Systems software and application software
Main function of systems software
Main function of systems software
Bridge between hardware & programs; controls hardware
Two key components of systems software
Two key components of systems software
Operating system and utility software
What is utility software?
What is utility software?
Specialized programs that perform system maintenance tasks
Four main types of utility software
Four main types of utility software
Encryption, defragmentation, compression, backup
What is encryption?
What is encryption?
Secret code system that scrambles data to protect it
Plaintext definition
Plaintext definition
Readable text before encryption
Ciphertext definition
Ciphertext definition
Scrambled text after encryption
What is fragmentation?
What is fragmentation?
Splitting files into chunks stored in different disk locations
Purpose of defragmentation
Purpose of defragmentation
Reorganizes scattered file pieces into continuous locations
Do SSDs need defragmentation?
Do SSDs need defragmentation?
No - no moving parts; access any location instantly
Lossy compression characteristic
Lossy compression characteristic
Permanently removes some data to reduce file size
Lossless compression characteristic
Lossless compression characteristic
Reduces size without deleting any information
Backup software purpose
Backup software purpose
Creates copies of important files in secondary storage
