Why is the reaction between methane and chlorine considered a substitution reaction

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Why is the reaction between methane and chlorine considered a substitution reaction?

Answer: Methane reacts with chlorine in the presence of sunlight to form chloromethane and hydrogen chloride.
        CH4+ Cl2    →   CH3Cl  + HCl

 With the excess of chlorine, aH the four hydrogen atoms of methane are replaced by chlorine atoms to form carbon tetrachloride (CCl4). This reaction is considered as substitution reactions because hydrogen of methane is substituted by chlorine.

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