In particle physics and string theory, what is mass?

We commonly say that something has a weight, which is synonymous with a mass. Things have a weight because the force of gravity is relative to something’s mass.

Subatomically, what is mass? There are massless particles, like photons. Is the concept of mass relegated to the smallest particles we know of, such as quarks, or is there any further explanation of what it is about some subatomic particles that gives them “mass”, others not?

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In particle physics and string theory, what is mass?

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