does the z buffer stores the z value of an object?

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C++

OpenGL

i made 2 spheres. second sphere is made by translating the first, 3 units on x-axis and 2 units on -z aixs. this is the code

glutSolidSphere(1.0,8,15);
glColor3f(0.0,0,0);
glTranslatef(3,0,-2);
glutSolidSphere(1.0,8,15);

if depth buffer enable

glDepthMask(GL_TRUE);
glDepthFunc(GL_LEQUAL);

after first sphere is drawn, depth buffer has z-axis value of first sphere. while drawing second sphere glDepthFunc(GL_LEQUAL); checks stored depth buffer value to the second sphere's value, if it is less than it draws tht pixel other wise not.

this is all wht i understand about depth buffer working. is this right? plz correct if m wrong