The proton is a subatomic particle with an electric charge of +1 elementary charge. It is found in the nucleus of each atom, along withneutrons, but is also stable by itself and has a second identity as the hydrogen ion, H+. It is composed of three fundamental particles: twoup quarks and one down quark.

And here is blueberry muffin analogy:

So, you can think of a proton as something like a blueberry muffin: The two u's and the d are like the blueberries, the blueness that stains the dough around them is like the pairs of additional quarks and anti-quarks that pop out, and the dough itself is the cloud of gluons that holds the whole thing together. Unlike a muffin, however, this sea of particles isn't static. It is constantly bubbling and rolling as new quark/anti-quark pairs are created and annihilated, emitting and absorbing gluons and pushing the extra u's and d all around inside. Of course, we can only see this when you look really close, which is what our accelerators let us do.