Answer:
Quarks are building blocks for subatomic particles. They are considered to be fundamental particles, and are thus not made up of other particles. Quarks bind together with gluons to make composite particles called hadrons. The most common examples of a hadron are neutrons and protons. Quarks are assigned names called flavors: up, down, strange, charm, top and bottom. Each flavor can be positive or negative. Quarks have been observed as resultants in collisions in particle accelerators, which leads to another characteristic of these fundamental particles: they cannot exist by themselves.
Quarks do not exist in isolation, so nearly everything we know about them is deduced from the examination of other particles and particle reactions. Most of this work is done in high energy physics laboratores where particle accelerators are used in experiments. It is thought that at the very beginning of the universe (the Big Bang) it may be that the extremely hot conditions allowed for the existence of unbound quarks in a quark-gluon plasma.
There is a lot more to learn about these curious particles, and an investigator can use the link below to do further reading and to gather more facts. Knowing a thing or two about quarks is essential for anyone who wishes to grasp the fundamentals of the Standard Model. This platform (the Standard Model) is used by physicists to describe the way the strong and weak interactions and the electromagnetic force mediate the way subatomic particles interact.