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# Implicit

Implicit means something that's assumed unless stated otherwise; it is the opposite of explicit. For example many floating point formats assume an implicit (not physically stored) bit with value 1 prepended to the explicitly stored mantissa values. Though not the same, the term implicit is similar to default; for example an implicit/default background color of some image format may be defined as white, meaning that unless background color is stated, we suppose the background to be white (though a default value may still be explicitly stored; default just means an initial, unchanged value). Implicit values may be important e.g. for saving space -- imagine we have some dataset in which 90% of values are zero; then it is convenient to state zero to be the implicit value and not store such values, by which we'll save 90% of space.

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