Software Classification (AQA GCSE Computer Science): Flashcards

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Systems Software
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Two main categories of software

Systems software and application software

Main function of systems software

Bridge between hardware & programs; controls hardware

Two key components of systems software

Operating system and utility software

What is utility software?

Specialized programs that perform system maintenance tasks

Four main types of utility software

Encryption, defragmentation, compression, backup

What is encryption?

Secret code system that scrambles data to protect it

Plaintext definition

Readable text before encryption

Ciphertext definition

Scrambled text after encryption

What is fragmentation?

Splitting files into chunks stored in different disk locations

Purpose of defragmentation

Reorganizes scattered file pieces into continuous locations

Do SSDs need defragmentation?

No - no moving parts; access any location instantly

Lossy compression characteristic

Permanently removes some data to reduce file size

Lossless compression characteristic

Reduces size without deleting any information

Backup software purpose

Creates copies of important files in secondary storage

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