The paper explores the large N correspondence between N = 4 superconformal gauge theory on D3-branes and maximal supergravity on AdS5 × S5, focusing on macroscopic strings as heavy (anti-)quark probes. The authors study the deformation and fluctuation of D3-branes when a macroscopic BPS string is attached, finding that the dynamics and boundary conditions agree with those in anti-de Sitter supergravity. They clarify how Polchinski's Dirichlet and Neumann open string boundary conditions arise dynamically. The paper also examines non-BPS macroscopic string anti-string pairs as a realization of heavy quark Wilson loops, obtaining the static potential from the supergravity side and observing nonanalyticity in the 't Hooft coupling parameter. The authors discuss the θ vacuum angle dependence of the static potential and speculate on the dynamical realization of heavy N-prong string junctions and large-N loop equations via local electric fields and string recoil. Throughout, they highlight the role of geometric duality between UV and IR scales in explaining how AdS5 spacetime geometry emerges from four-dimensional gauge theory at strong coupling.The paper explores the large N correspondence between N = 4 superconformal gauge theory on D3-branes and maximal supergravity on AdS5 × S5, focusing on macroscopic strings as heavy (anti-)quark probes. The authors study the deformation and fluctuation of D3-branes when a macroscopic BPS string is attached, finding that the dynamics and boundary conditions agree with those in anti-de Sitter supergravity. They clarify how Polchinski's Dirichlet and Neumann open string boundary conditions arise dynamically. The paper also examines non-BPS macroscopic string anti-string pairs as a realization of heavy quark Wilson loops, obtaining the static potential from the supergravity side and observing nonanalyticity in the 't Hooft coupling parameter. The authors discuss the θ vacuum angle dependence of the static potential and speculate on the dynamical realization of heavy N-prong string junctions and large-N loop equations via local electric fields and string recoil. Throughout, they highlight the role of geometric duality between UV and IR scales in explaining how AdS5 spacetime geometry emerges from four-dimensional gauge theory at strong coupling.