OPERATING SYSTEM(OS)

It is a System software program that work as interface between user and Computer.

It is important  component of a computer system (system software) which controls all other components of the computer system

OS is the first software to be loaded into computer memory when the computer is switched on and this is called booting. 

Example Computer OS: 

window XP, Window 10, Window 8, Ubuntu, BOSS, Linux, MAC OS etc

Example of Mobile OS: Android OS

Source code and Object code ?

A source code  refers to the program code written by a programmer in a high level  programming Lanuague (HLL) like python, C,c++, Java, .Net, PHP etc.

An object code refers to a code written in binary  or machine language, a language that computer can understand  easily and run on hardware

Translator programs are used to translate source code into object code

Anti-virus 

is a  program that protects a computer against viruses.

It is a computer program used to prevent, detect, and remove malware.

It Blocks websites infected with viruses and malware. Protection against online threats.

An antivirus is capable of quickly scanning any removable device connected to the computer to identify potential threats.

Protection from identity theft by blocking spyware

Prevention from phishing attacks

Some Antivirus programs are vast ,Panda Cloud, Avira, AVG ,Avast, Malware bytes, Quick heal,NOD32,McAfee etc 

Disk Cleanup (cleanmgr.exe) is a computer maintenance utility included in Microsoft Windows designed to free up disk space on a computer's hard drive. The utility first searches and analyzes the hard drive for files that are no longer of any use, and then removes the unnecessary files. There are a number of different file categories that Disk Cleanup targets when performing the initial disk analysis:

·Compression of old files

·Temporary Internet files

·Temporary Windows files

·Downloaded program files

·Recycle Bin

·Removal of unused applications or optional Windows components

·Setup log files

Offline web pages (cached) 

Backup software are computer programs used to perform backup; they create duplicate copy of files, databases or entire computers. These programs may later use the supplementary copies to restore the original contents in the event of data loss.

A file compression utility is a software program that is used to compress or decompress files. Most often such a software program is used to compress files of various formats that are no longer being actively used and reduce their size so that they take up about 40 percent less space on hard disk.

latest versions of Microsoft Windows includes

a compression utility for creating and extracting .zip files

 and Linux has tools for .tar.gz and .zip files.

Example of compression utilities

7-Zip

PKZIP

WinAce

WinZip

WinRAR

File Management tools

A file manager or file browser is a computer program that provides a user interface to manage files and folders.

The most common operations performed on files or groups of files include creating, opening , renaming, moving or copying, deleting and searching for files,

as well as modifying file attributes, properties and file permissions. Folders and files may be displayed in a hierarchical tree based on their directory structure. Sorting file in alphabet or another order.

Example: Window Explorer, Microsoft OneDrive. Dropbox. Apple iCloud. Google Drive.