ASCII (America Standard Code for Information Interchange) - An 8-bit character set used for representing English keyboard characters., Binary - A number system that contains two symbols, 0 and 1. Also known as base 2., Bitmap - A file format used to store digital images organised as a grid of coloured squares called pixels., Character set - A set of symbols that can be represented by a computer. These symbols, called characters, can include letters, digits, spaces, punctuation marks and control characters., Colour depth - The number of bits used to represent each pixel in an image., Denary - The number system most commonly used by people. It contains 10 unique digits 0 to 9. Also known as decimal or base 10., Hexadecimal - A number system using 16 symbols from 0-9 and A-F, also known as base 16 and hex., Metadata - Data about data. Extra data stored in a file which gives information about the file's properties, Pixel - Picture element - a single dot of colour in a digital bitmap image or on a computer screen, Resolution - The number of pixels used in an image, Unicode - A character set. Incorporates characters from almost all global languages. A 16-bit extension of ASCII., Compression - A method of reducing file sizes, particularly in digital media such as photos, audio and video, Lossless - A form of compression that encodes digital files without losing detail. Files can also be restored to their uncompressed quality., Lossy - A form of compression that reduces digital file sizes by removing data,

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