Yes, everything (even oxygen which we can not hold in our hands) is made up of atoms (smallest base unit of matter.)
I really think the answer depends on how you define matter. If you define it as something with mass, then no, not everything is composed of “matter”. Photons are massless, which is the reason light travels as fast as it does, and therefore would not be considered, based on our given definition, to be made of “matter”. This, however, is really a question of semantics.
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