In Science What Is a Quark?

Quark, any member of a group of elementary subatomic particles that interact by means of the strong force and are believed to be among the fundamental constituents of matter. ... Quarks appear to be true elementary particles; that is, they have no apparent structure and cannot be resolved into something smaller.

What is a quark in simple terms?

: any of several elementary particles that are postulated to come in pairs (as in the up and down varieties) of similar mass with one member having a charge of +²/₃ and the other a charge of −¹/₃ and are held to make up hadrons.

What is an example of a quark?

Protons consist of two up quarks and one down quark, whereas a neutron is made up of two down quark and one up quark. Quarks cannot exist independently but as a constituent part of the matter.