Each piece of application software processes data. It involves editing and manipulating data.
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Text and numbers are edited in many different ways such as deleting, inserting, moving and copying. In a spreadsheet, calculations are performed using formulas. Errors in text are corrected using a spell checker and a grammar checker. The structure of a database can be modified to take into account new requirements.
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Images are edited using graphics tools. Graphics can be positioned, cropped, resized and distorted. When you enlarge a bit-mapped graphic, you also enlarge each pixel and create a jagged staircase pattern called aliasing. Vector graphics are easily edited using a drawing program.
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Video and audio are edited using digital video production software and audio software. Editing video involves adding text, audio and graphics to the video clip. Sounds are edited in many different ways such as deleting sounds, changing the speed, adding effects such as echo, overlaying (mixing) sound files and altering the quality of the sound file.