OpenGL - Bind Buffer Arrays question

So this is probably a simple question:

But how come sometimes I see it like this:

GLuint vbuffer;
glGenBuffers(1, &vbuffer);
glBindBuffer(GL_ARRAY_BUFFER, vbuffer);

but when done in multiples:

GLuint VBOs[2]
glGenBuffers(2, VBOs);
glBindBuffer(GL_ARRAY_BUFFER, VBOs[0]);

Im curious why glGenBuffers has a & in the first one, and not in the second case. Is it because arrays are always passed by reference? and is vbuffer a POINTER to something or just a simple data structure (GLint in this case).