Alloys are mixture of two or more metals. e.g.- steel, copper

they are considered better because the get the property of both metals 
eg- steel is an alloy of iron and chromium that is why it is strong as iron and shiny as chromium.
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Alloys are mixture of two or more metals......

Metal alloys are typically either harder, stronger, lighter or more flexible than a comparable pure metal that is why alloys are  considered more better than a pure metal 
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An alloy is a material composed of two or more metals or a metal and a nonmetal.[1] An alloy may be a solid solution of the elements (a single phase), a mixture of metallic phases (two or more solutions) or an intermetallic compound with no distinct boundary between the phases.
dear GUNSANDROSES u have copied fro wikipedia which is not allowed here