The International Young Catholic Student (IYCS) is a Catholic action movement of the apostolate of Laity. It is traditionally an evangelization agent in schools and student milieu (secondary and higher education). 

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IYCS is recognized by the Holy See as an International Catholic Organization (ICO) and the Pontifical Council for the laity is its dicastery. 

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In international institutions, IYCS is committed to the United Nations (UN) operational status with UNESCO. 

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Mainly composed of pupils and students, IYCS is present in 87 countries.