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A standard is a basis for comparison. Standards are made either by many people that agree on something, or if some organisation makes it so. There are many different standards in many fields of daily life. Standards are important so that correct comparisons can be produced.
Other standards make things work together. For example, rail cars with a standard gauge can run on tracks that follow the same standard. Communication protocols such as Morse code and USB are standards that allow different machines and people to communicate.