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Compression, from the latin compressĭo, is the action and the effect of compressing. This verb returns to action to strengthen, tighten, oppress or reduce to low volume.
Examples: "bags are in the trunk to compression, so take care during the journey', 'the doctor recommended me to wear larger pants because tightest are deprecated because of compression of the stomach,'"compression of the file is not yet complete.
The compression can be a physical or mechanical process subjecting a body to the action of two opposite forces to decrease its volume. Means compressive stress the result of these tensions.
A filled foam cushion can be compressed if we exert force with two hands to reduce. Due to its characteristics, once you stop to force, the cushion retrieves regular its shape and size. However, inserting it, when it is compressed in a small space that prevents it from growing up or if it attaches it, it is also possible to reduce its volume.
In the field of information technology, data compression is used to reduce the weight of a digital file from a reduction in the volume of data that can be processed. This means that the file in question, after compression, occupies less space.
The compression is done on the basis of three types of information: Basic (information to be transmitted so that the signal can be rebuilt), redundant (repetitive information) or irrelevant / unimportant (its removal does not affect the content). The compression type can therefore take place without real losses, subjectively without losses or subjectively with losses.