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Master–slave (technology)
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Look up <i>master</i> or <i>slave</i> in Wiktionary, the free dictionary. <p>In <a href="/facts/Engineering/RFVg8H3I">engineering</a>, master–slave is a relationship between two systems in which one controls the other. In some cases one master controls just one slave system, but in others there are multiple slave systems controlled by the same master. Sometimes the master is a different kind of system than the slave, but sometimes there are multiple similar systems and one of them is designated the master in order to centralize external (i.e. user) control of the collection. </p><p>Due to its connection to <a href="/facts/Slavery/IXX2S92u">slavery</a>, the terminology is a subject of controversy and has been replaced with alternative terms in some cases. </p>